The Reddy Anna Online Book refers to an unofficial online betting platform that provides users with access to sports betting markets, mainly focused on cricket, football, and other popular games in India. It operates through a digital interface, often using websites or apps, and facilitates live betting, odds checking, and payouts. The term "book" comes from "bookmaker," a common term in the betting industry. While widely used in underground betting circles, the platform is not legally authorized in most Indian states. Users should be cautious and fully understand the legal and financial risks associated with using such services.