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What is Order Book?
An order book is a real-time list of buy and sell orders on an exchange, organized by price. It shows market depth: how much buying/selling pressure exists at each price level.
Full Explanation
An order book is a live, continuously updated ledger of buy orders (bids) and sell orders (asks) for a trading pair on a centralized exchange. Bids are sorted highest-first; asks are sorted lowest-first. The gap between highest bid and lowest ask is the "spread" (tighter = more liquid). Order book depth shows how much volume exists at each price level, indicating support/resistance zones. Large buy walls (many bids at a price) suggest strong support; large sell walls suggest resistance.