What is e621 met?

e621 is an online community-driven repository of anthropomorphic animal-based ("furry") artwork. It was founded in 2006 and contains over 1.5 million images as of 2021. Users can upload and tag their own artwork and search for images based on tags. The website has been controversial at times due to the nature of its content, including pornographic material, and has faced legal issues related to copyright infringement.