Technical analysis uses historical market data like price and volume to identify patterns and trends that can suggest future price movements. Technicians analyze charts using tools like bar charts, candlestick charts, moving averages, and indicators. Common patterns include head and shoulders, triangles, and double tops/bottoms. Oscillators like MACD and RSI are used to identify overbought and oversold levels. Bollinger Bands provide buy and sell signals when the stock closes above or below the bands. Technical analysis is the attempt to forecast stock prices based on trends and patterns in historical price data.