A chart that displays a security's open price, high price, low price, and close price using one vertical line for each time period. The time period could bea day, week, month, etc. Bar charts are the most popular way of displaying price movements. The vertical length of the bar is the price range from height to low. A little horizontal line or tick represents the open or close price. The tick on the left side is the open price, and the tick on the right side is the close price.