Keyframing is a technique used in animation and video editing to create smooth transitions between different states or positions. It involves setting specific points, called keyframes, that define the start and end of a movement or change. The software then automatically fills in the frames in between, creating a fluid motion. In addition to animation, keyframing is also used in audio editing to adjust volume levels or effects over time. By placing keyframes at different points in an audio track, editors can control how sound evolves, enhancing the overall experience for the audience.