A summary of price data over a fixed interval (bar). An OHLC bar shows four key prices: open, high, low, and close. It is often depicted as a bar or candlestick on charts. OHLC data is commonly used in backtesting and technical analysis. In an OHLC chart, “each vertical line on the chart shows the price range (the highest and lowest prices) over one unit of time, e.g., one day or one hour… with tick marks indicating the opening price … on the left, and the closing price … on the right”. Forex algorithms frequently use OHLC bars (e.g. 1-minute bars) instead of raw ticks to reduce data volume or apply indicators.

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