It’s for showing a varying value over a time period.
Designed for a stock price over a day. It looks like a candle, with a wick at the top and bottom.
The body of the candle shows the opening and closing price for a day. The upper and lower wicks show the highest and lowest price for that day.
The candle is solid colour if the price has ended the day down, and not solid if the price has ended the day up.
Show 30 or 90 days of candles together and you quickly get a picture of price trends together with volatility by day and over time. Which can give a better picture of just averaged price over time.
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