Question

What is keyframe? Explain about it

Answer 1

In media production, a key frame is a location on a timeline which marks the beginning or end of a transition. It holds special information that defines where a transition should start or stop. The intermediate frames are interpolated over time between those definitions to create the illusion of motion. In computer animation, like 3D animation or non-linear video editing, this interpolation is performed mathematically by the CPU.
In the following screenshot from Adobe After Effects, the keyframes are highlighted with red arrows. Each of the keyframes defines a position of the animated logo (first on the left, and then one second later on the right). When the animation is played, the logo transitions smoothly from the start position to the end position.

Answer 2

A Keyframe is a term mainly used in Animantion and media related stuff. It is kind of like a drawing which holds the information marking the starting and ending point of a transition. The intermediate drawings are defined as 'Frames'.

                   The sequence of the Keyframes generates the image and movements to the eyes of the viewers, and the position of these Keyframes marks the timings in a video or animation. They also have usages in audio production, video comperssion, and editing of audio/videos.