Time-Lapse Photography is the technique of capturing images at a lower frame rate than the viewing frame rate thus making the scene move faster. For example, if you’re taking 2 frames per second (fps) and stitching them together at 30 fps, the movie will be 15 times faster.
Time-Lapse photography is essentially the opposite of slow motion photography.
Here are 2 examples shot with a DSLR and stitched in Adobe Premiere.
It’s now easier than ever to create time-lapse videos with your mobile devices as well. If you’re running iOS 8 or above, the basic camera app has a simple time-lapse feature which is fully automatic. If you’d like total control over the creation of your time-lapse, here are 2 great iPhone apps that I suggest:
Wikipedia has a complete description for you geeks out there. 🙂