Hold keyframes keep a value locked until the next keyframe happens, with no in-between motion or tweening.
Steps to use hold keyframes
Set keyframes on a property like Position.

Right-click one of your keyframes and choose Toggle Hold Keyframe.

Now the property instantly jumps to the next value without animating smoothly between them.

One more thing
This type of keyframes is great for stop-motion effects, step-by-step animations, or keeping text locked onscreen for a specific duration before it moves.
Related how-tos
How to add keyframes in After Effects
How to reverse animations in After Effects
How to use the wiggle expression in After Effects
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