The last opposite-direction candle before a strong, impulsive move — a zone where large orders are assumed to have been placed.
A bullish order block is the last down-candle before a sharp rally; a bearish order block is the last up-candle before a sharp drop. The idea is that institutions filled sizeable orders there, so price may respect the zone if it returns.
When price revisits an order block it often reacts — bouncing from a bullish block or rejecting from a bearish one — making them potential entry areas in the direction of the impulse.
Find a strong impulsive move that broke structure, then mark the last opposite-colour candle before it started. That candle's range is the order block.
Order blocks are a discretionary, retail interpretation of institutional activity — a proxy, not confirmed order flow. They fail often, so pair them with structure and confirmation.
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