A bar chart is a visual representation of price movements in the financial markets. Each bar on the chart represents a specific time period, such as a day or an hour, and contains four crucial data points: the opening price, closing price, highest price (high), and lowest price (low) during that period. The vertical line represents the price range between the high and low, while horizontal lines extend from the left and right, indicating the opening and closing prices, respectively. Bar charts provide a concise overview of price action, making it easy for traders and analysts to identify trends, reversals, and key support/resistance levels. They are a fundamental tool in technical analysis, offering a historical perspective on market behavior and aiding decision-making for market participants.