In trading, the most useful chart type depends on the trader's strategy and the type of data being analyzed. Generally, traders use candlestick charts or line charts to analyze price movements in financial markets.

Candlestick charts are more useful for short-term trading, as they provide detailed information on price movements, including the opening and closing prices, as well as the highs and lows. They also show the trend direction, allowing traders to make informed decisions on buying or selling.

Line charts are useful for identifying long-term trends and support and resistance levels. They provide a simplified view of price movements over time, making it easier to identify patterns and trend lines.

Overall, the most useful chart type in trading depends on the trader's strategy, the data is analyzed, and their preference for interpreting and analyzing the data presented in the chart.

In forex , the usefulness of a chart depends on the trader’s strategy, but the candlestick chart is generally considered the most useful for many traders. It provides more detailed information compared to line or bar charts. Each candlestick represents the price movement over a specific period, showing the opening, closing, high, and low prices in a visually intuitive way. Candlestick patterns can signal market sentiment and potential reversals, making them valuable for technical analysis.

Other charts, such as line charts, are simpler and good for identifying long-term trends by connecting closing prices. Bar charts offer similar data to candlestick charts but in a more condensed form. For advanced traders, Renko or Heikin-Ashi charts may also be useful for filtering out noise and focusing on the trend's strength.