What is Webmaster?

Legal Definition
A webmaster (from web and master), also called a web architect, web developer, site author, website administrator, website coordinator, or website publisher is a person responsible for maintaining one or many websites. The duties of the webmaster may include: ensuring that the web servers, hardware and software are operating correctly, designing the website, generating and revising web pages, A/B testing, replying to user comments, and examining traffic through the site. Webmasters of commercial websites may also need to be familiar with ecommerce software.

Due to the RFC 822 requirement for establishing a "postmaster" email address for the single point of contact for the email administrator of a domain, the "webmaster" address and title were unofficially adopted by analogy for the website administrator.

Webmasters may be generalists with HTML expertise who manage most or all aspects of web operations. Depending on the nature of the websites they manage, webmasters may be required to know scripting languages such as ColdFusion, JavaScript, JSP, .NET, Perl, PHP and Ruby. They may also need to know how to configure web servers and be a server administrator. Most server roles would however be overseen by the IT Administrator.

Core responsibilities of the webmaster may include the regulation and management of access rights of different users of a website or content management system, the appearance and setting up website navigation. Content placement can be part of a webmaster's numerous duties, though content creation may not be.
-- Wikipedia
Legal Definition
Person who creates, manages and maintains web sites and servers.