They are used to chart price action that displays the high, low, open and close prices for the specified period. This highly depends on the candlestick that closes high/low from the opening price. This will have a colour difference, normally, red or green that red marks the down candle and green marks the candle, which is closed higher. It can be displaced in various time frames, from the monthly with daily chart throughout the way down to less than the minute data.
