Flickr is an image hosting and video hosting service, as well as an online community, founded in Canada and headquartered in the United States. It was created by Ludicorp in 2004 and was a popular way for amateur and professional photographers to host high-resolution photos. Flickr has changed ownership several times and has been owned by SmugMug since April 20, 2018.

Flickr is a photo-sharing platform and social network where users upload photos for others to see. Users create a free account and upload their photos via the web, mobile devices, or from whatever software they are using to manage their content. Flickr provides a platform for users to share and embed personal photographs and an online community. It also allows users to give their friends, family, and other contacts permission to organize their photos and videos.

Flickr has several features, including tags, marking photos as favorites, group photo pools, and interestingness. Users of Windows Photo Gallery, Apples iPhoto, Adobes Lightroom, Apples Aperture, darktable, and digiKam have the ability to upload their photos directly to Flickr. Flickr also has a mobile app available on both the App Store and Google Play.

In summary, Flickr is an image hosting and video hosting service that allows users to share and organize their photos and videos with others. It also provides an online community for photographers and other creators.