OHLC stands for Open–High-Low-Close. This type of chart is used to display trading products over time. Each vertical line on the chart shows the price range (the highest and lowest prices) over one unit of time.
On the below example, the number of price changes over the minute does not range above 295. The number in the top left shows the count of price changes during that period. For the example below, it is showing how many changes for the current minute.
