You can set keyframes with Auto interpolation or change a keyframe’s interpolation after the keyframe is already set.
To set keyframes with Auto interpolation:
These options let you set keyframes with Auto interpolation, each with a different behavior. See Auto interpolation.
Key Controls with Spline or Smooth selected A. Type menu
To change the interpolation of a keyframe to Auto:
FCurves window (detail) A. Auto interpolation type selected for the Translation keyframes
FCurves window A. Tangent area settings
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