A Candlestick Chart is one of the most popular chart types, visualizing the same OHLC data as bar charts but with a filled or hollow body that makes trends and patterns easy to spot. Each “candle” has a body (rectangle) showing the range between open and close, and thin lines (“wicks” or shadows) showing the high and low of the period. Candlesticks quickly convey bullish vs. bearish periods (commonly green for up, red for down) and form recognizable patterns used in technical analysis. Relevance to EAs: Many automated strategies are built around candlestick data and patterns. Forex robots may analyze candlestick shapes (e.g. long wicks or engulfing patterns) as entry or exit signals. Because candlesticks emphasize the relationship between open and close, a robot might use this to gauge momentum (e.g. two consecutive long bullish candles could trigger a trend-following EA to buy). In essence, candlestick charts provide rich price context that EAs can interpret algorithmically, mirroring how human traders use candlestick patterns to predict future price movement.

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