Candlesticks have been around for centuries, they are a type of bar chart that shows the trader the high, low, open and close of a security. The advantage of them is they are very easily to follow.
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Candlesticks are excellent for spotting chart patterns such as head and shoulders patterns. Commonly if the candle is bullish the body of the candle will be blue and if it’s bearish it is often red. However, most charting software allows you to fully customize the colours.
Here is an example of a GBP/USD daily chart using candles:
