Web hosting is a service that allows individuals and organizations to make their website accessible online by providing space on a server to store website files. There are different types of hosting including shared hosting, where resources are shared across multiple websites, VPS hosting, where each website has its own dedicated space, and dedicated hosting, where a single website has exclusive access to the server. To make a website accessible, one must register a domain name, which acts as the website's address, and choose a hosting plan from a provider to store the website files on their servers and make the site publicly available.