Image credit Blossoming geraniums. Two hours are compressed to a few seconds
Time-lapse photography is a method that helps you capture film frames at low frequency. But when it is played back to view the sequence, it moves faster.
For example, an image of a scene may be captured once every second, then played back at 30 frames per second; the result is an apparent 30 times speed increase. In a similar manner, film can also be played at a much lower rate than it was captured at, slowing down fast action, as slow motion or high-speed photography.
Source: https://en.wikipedia.org/wiki/Time-lapse_photography