Flickr is a photo and video hosting website that offers three account types: free with 1TB storage, ad-free for an annual fee, and double storage for a higher fee. It focuses on being a community for photographers rather than just photo sharing. Created in 2004, it was purchased by Yahoo for $35 million. Key features include tags for organizing photos by topic, collections to group photos, and geo-tagging photos with locations. The site encourages users to join groups, tag photos well, share on other sites like blogs and Pinterest, and allow creative commons use of their photos. Some businesses have used Flickr successfully for customer engagement and marketing through uploaded photos.