This document discusses various types of stock indexes and provides examples of two major Indian indexes, Sensex and Nifty. It defines an index as a statistical measure that captures market changes. There are three main types of indexes: market capitalization weighted, which gives weight based on company size; free-float market capitalization weighted, which excludes shares not available for public trading; and price weighted, which gives weight based on share price. Sensex tracks the top 30 companies on BSE using free float market capitalization, while Nifty tracks the top 50 companies on NSE using the same method. Both are important benchmarks for measuring market movements and fund performance.