What an order block is
An order block is a concept from price-action analysis that points to one specific origin: the compact candle range that immediately preceded a strong, sustained move in a single direction. What defines it is the causal story attached to that exact range. The idea is that a concentration of buying or selling was committed there, and that this footprint is what set the subsequent move in motion. The concept is about identifying that originating range and the price action that came out of it, not about cataloging every level where price once paused.