What is OHLC?
OHLC stands for Open, High, Low, and Close, the four prices that describe one period of trading. The open is the first traded price of the period and the close is the last; the high and low are the most extreme prices reached in between. Candlestick charts and bar charts both display these four values for every bar.
Why OHLC matters
OHLC is the raw data behind candles and bars, so understanding it lets you read any chart style.
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