Trading - Bollinger Band

: The middle band plus two standard deviations . It often marks potential "overbought" areas.

The Bollinger Bands Trading Strategies: With Practical Charts and Codes to Use Bollinger Band Trading

: The middle band minus two standard deviations. It often marks potential "oversold" areas. Three Primary Trading Strategies Go to product viewer dialog for this item. : The middle band plus two standard deviations

Bollinger Bands are a versatile volatility indicator developed by John Bollinger in the 1980s. They consist of three lines that "breathe" with the market, expanding when volatility increases and contracting when it decreases. Bollinger Band Trading