What are bollinger bands?

[Akimtiuvd]

What are bollinger bands? What do they determine? How do you use them? I watched some youtube videos of these guys who trade entirely with bollinger bands.

[Alekseymelt]

I would check out the site in your signature line. It looks like it may hold the answer.

Bollinger Bands serve a purpose, but as with all indicators, must be studied and applied by the user with sound risk and trade management.

[Albertgax]

I can tell you all about bollinger bands, but its just easier to give the link

http://www.en.wikipedia.org/wiki/Bollinger_Bands

It is very commonly used indicator and you should know how to use it.

[AlfredKa]

Here's a thorough explanation: CLICK ME (http://stockcharts.com/school/doku.php?id=chart_school:technical_indicators:boll inger_bands)

[admin]

Bollinger bands are a measure of price volatility over a predetermined timeframe.

For example, the base Bollinger band setting in most trading platforms is 20,2 which means two standard deviations (95% of all occurances) above and below based on the the price activity of the last 20 periods.