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{{Mmwiki|Frame types}}
A frame is a still image. Video is made up of many frames per second to create the illusion of movement.<br />
The number of frames to be displayed per unit of time is expressed in ''frames per second'' (fps) or ''Hertz'' (Hz). These are different terms for the same measurement.

== Types ==
{{Wikipedia|Video compression picture types#Summary|l1=Video compression picture types|Inter frame#Frame types|l2=Inter frame &sect; Frame types}}

Key frames (keyframes) and I-frames are the same.<sup>[[#note_1|&dagger;]]</sup>

Digital video compression techniques involve [[compression]] of frames:
;I-frame: A full ''''I'''ntra-coded picture'
;P-frame: ''''P'''redicted' from previous frame(s)'s picture
;B-frame: ''''B'''i-predictive' or ''''B'''idirectional' calculated from surrounding frames's pictures. Can painlessly be skipped.


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<sup><span id="note_1">&dagger;</span></sup> <small>[https://www.quora.com/What-is-the-difference-between-an-I-Frame-and-a-Keyframe-in-video-encoding/answer/Keith-Winstein This Quora answer] says that although the terms are used interchangeably, a ''key frame'' is an ''I-frame'' with the property of being a point from which a decoder can start decoding</small>

[[Category:Glossary]]