If images in Photoshop are just well organized data, then adjustment layers are the knobs, dials, and sliders you use to adjust that data. Adjustment layers take in image information, apply some math, and kick out the results on the other side. The controls on an adjustment layer let you change some parameters of that math to some extent, and can affect both individual pixels as well as how those pixels relate to each other.
There are 25 unique layer adjustments in Photoshop, 16 of which are also available as adjustment layers that you can add to your layer stack directly. Another three are fill layers, and the remaining six ...
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