Opening Range Breakout marks the high and low of the first portion of a trading session, commonly the first 15 minutes, as a defined range, then enters long on a break above that range's high (or short on a break below the low, where shorting is available). The idea: the opening period reflects the market digesting overnight/pre-session information, and a decisive break of that range signals which way the session's real conviction lies.
It's a fast, intraday style. Trades typically resolve within the same session, and it's prone to the same fakeout risk as any breakout system, which is why real implementations usually require confirmation (volume, or a minimum distance past the range) rather than acting on the first tick past the level.
zengtrade's ORB strategy runs on 5-minute bars with a 15-minute opening range, and requires both a volume-above-average confirmation and a minimum ATR-based buffer past the range high before entering, specifically to reject the thin, marginal breaks that back-testing showed were unprofitable on their own.
Educational content, not investment advice. zengtrade is paper-first and non-custodial.