YouTube is an online video platform where users can upload, watch, and share videos. The platform offers a wide range of content, including music videos, vlogs, tutorials, live streams, and movies. YouTube is free to use, but also has paid services such as YouTube Premium, which allows users to watch videos without ads, download videos, and access YouTube Music. In addition, there is YouTube TV in select countries, which allows streaming of live TV channels. YouTube is available on computers, smartphones, tablets, and smart TVs.