A Bar Chart is a basic chart type that displays price movement over a period using vertical bars. Each bar represents the open, high, low, and close (OHLC) of the timeframe, drawn as a vertical line (high to low) with a tick on the left for the opening price and a tick on the right for the closing price. Bar charts convey the same OHLC information as candlesticks but in a minimalist style. Relevance to EAs: Automated trading systems use OHLC data from bar charts to calculate indicators and signals. For example, a forex robot might read the bar’s high and low to set stop-loss or take-profit levels, or check the open vs. close to determine if a bar is bullish or bearish. Bar charts are timeframe-dependent, so an EA on a 1-hour bar chart processes a new bar (and thus potential new signals) every hour, whereas on a 5-minute bar chart it reacts more frequently to price changes.

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