Bollinger Bands
Technical analysisA moving average with bands placed a set number of standard deviations above and below.
In plain terms
They define what is statistically normal for this stock — not what is expensive.
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Glossary
Every term is defined twice: once the way a filing would put it, and once the way somebody would explain it to you across a table. The second one is usually the one that sticks.
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Keltner channel
Technical analysisA volatility band drawn a set number of ATRs above and below an exponential moving average — similar to Bollinger Bands but using ATR rather than standard deviation to set the width.
In plain terms
Bands around a moving average, sized by ATR. A steadier cousin of Bollinger Bands.
Squeeze
Technical analysisA contraction of Bollinger Bands to an unusually narrow width, indicating collapsed volatility.
In plain terms
Predicts the size of the coming move, never its direction.
Standard deviation
Technical analysisA statistical measure of how widely a series is dispersed around its own average; Bollinger Bands sit two of them either side of a 20-day mean.
In plain terms
It is recomputed every session, which is why the bands widen when a stock turns volatile and contract when it goes quiet. Touching a band means statistically unusual, never expensive.