Web hosting is a service that provides Web users with online systems for storing information, images, video, or any content accessible via the web. Web hosts are companies that provide space on a server they own for use by their clients.

The type of hardware, security, high-speed internet connections and physical housing requirements required to reliably serve web content and email necessitates the storage of client content on servers in secure data rooms with redundancy and power backups. Therefore web hosting is usually offered by companies who rent out space on their servers to customers.