What is OHLC

Definitions 

OHLC: An open-high-low-close chart (also OHLC) is a type of chart typically used to illustrate movements in the price of a financial instrument over time. 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.

It may look like this

Let me explain it again

OHLC stands for the open, high, low, and close prices of a share’s price on a trading day.
Normally on a chart, this is visually represented by a vertical line between the low price and the high price with a left and right horizontal ledge showing the open price (left) and close price (right).
Normally a green bar indicates a close price above an open price and a red bar indicates a close lower than the open

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