A webmaster is someone who creates and manages the content and organization of a website, manages the computer server and technical programming aspects of a website, or does both.

A webmaster email address is the email address for that person or department. Traditionally, it's webmaster at [domain], but it can be anything you want. Generally people set up the webmaster email address so it works and goes somewhere.

Google Webmaster Tools - now Google Search Console - is a free tool by Google that allows users to check how their website is performing in the search results and whether it experiences any issues that can affect that performance. It was launched in June 2005 as Sitemaps, an XML tool.

Merriam-Webster claims the first known use of the word "webmaster" was in 1993, years before Google even existed. However, the term is becoming archaic, and according to the data found in books, its use is in sharp decline.