A bar chart displays a security's price action over a defined period using vertical bars, where each bar represents the high, low, open, and close for that session. The top of the bar marks the session's high, the bottom marks the low, a small tick to the left indicates the open, and a tick to the right shows the close. While candlestick charts have largely replaced bar charts in popularity among retail traders, bar charts remain widely used in commodity and forex markets and by practitioners of classical technical analysis. The OHLC (Open-High-Low-Close) information in each bar provides a complete picture of price activity for that period.