What is the ATR indicator in Tradingview?

Could you elaborate on the ATR indicator in Tradingview and its significance in trading strategies? I'm curious to know how traders utilize this indicator to assess market volatility and potentially identify entry and exit points. Does it work across different asset classes, or is it more specific to certain markets? Additionally, I'm interested in understanding how the ATR is calculated and how it's displayed visually on the TradingView platform. I'd appreciate a concise yet thorough explanation of its functionality and potential applications in trading.