ab is a simple load testing command from Apache. It benchmarks your HTTP server by automating a scenario of sending multiple requests with concurrent clients.
There are wonderful people who write in-depth articles about their work; unfortunately, search engines are pretty much fooled by the tricks of bloggers who just write for the sake of content publication.
YouTube was originally created as a platform for anyone to post any video content they desired. It was hoped that users could use the site to upload, share, and view content without restriction.