📊 What Are Bollinger Bands? 4 The Bollinger Bands Trader Indicator Free Download is one of the most searched trading tools among beginners and professional traders alike. But before downloading it, it’s essential to understand what Bollinger Bands actually are and how they work. Bollinger Bands were developed by John Bollinger in the 1980s. They are a technical analysis tool that measures market volatility and identifies overbought or oversold conditions. The indicator consists of three lines: Middle Band – A...