YouTube is an online video sharing platform that allows users to upload, view, rate, share, and comment on videos. It was founded in 2005 and has since become one of the most popular websites on the internet. YouTube offers a wide variety of content, including music videos, educational videos, movie trailers, and much more. It is also a great platform for content creators to share their work with the world. With its easy-to-use interface and vast library of content, YouTube has become a go-to source for entertainment and information.