指数基金是一种根据特定指数的表现来进行投资的基金。它的投资方式是通过购买和持有指数中包含的所有股票或其他资产，以追踪指数的表现。指数基金的目标是让投资者获得与所选择指数相似的收益。

指数基金的特点之一是低成本。由于它们的投资策略是 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 passively managed，即 pass