A webmaster is an individual who maintains a website. A webmaster may be a web developer and the same individual that built a particular website, but the duties of a webmaster are aimed at handling the upkeep of a functioning website.

web·​mas·​ter ˈweb-ˌma-stər often capitalized : a person responsible for the creation or maintenance of a website especially for a company or organization

Wikipedia defines a webmaster as: A webmaster (a blend of web and master), also called a web architect, web developer, site author, website administrator, or (informally) webmeister, sometimes heard in tongue-in-cheek feminine form web mistress, is a person responsible for maintaining a website (s).

A webmaster, also called a web architect, web developer, site author, or website administrator, is a person responsible for maintaining one or many websites.

A webmaster is a person responsible for managing a website and ensuring that it's working smoothly. Several factors can affect a website and cause it to malfunction or break. It is also the webmaster's job to prevent this from happening. A webmaster's job will vary depending on the size and nature of the website.