From a user's perspective, all of these search engines operate in the same general way: Download an image to your device and upload it to the search engine, which generates a list of websites that have previously posted that picture. There are a number of different reverse image search engines available online, including Google Images, TinEye, Yandex, and Bing Images. If you see pictures online that make you a little suspicious, you may be able to use a reverse image search engine - an internet search engine that focuses on images rather than text - to obtain some additional context. Oftentimes, those pictures are manipulated and/or the videos are miscaptioned such that they purport to depict something they do not.
Social media users are inundated with a constant stream of videos and pictures.