Nineteen years ago today, a young man posted the first-ever video on YouTube. Jawed Karim published a video titled "Me at the Zoo" on April 23, 2005. The YouTube co-founder created it while standing in front of an elephant exhibit at the San Diego Zoo.

YouTube is an American online video sharing platform owned by Google. Accessible worldwide, YouTube launched on February 14, 2005, by Steve Chen, Chad Hurley, and Jawed Karim, three former employees of PayPal.

The YouTube algorithm is a recommendation system that decides which videos to suggest to a particular viewer. The algorithm's job is to rank content based on the likelihood that a viewer will watch it using signals like relevance, quality, and user behavior.