What is a website?

A website is a space on the internet offering information or selling products. It is like an electronic brochure which can be accessed from the Internet almost 24 hours a day and from any location. For example this page is a part of the website The Online World. A website may be a collection of one or many such pages called web pages.
Typically a web page is written in (X)HTML and can be accessed via the HTTP protocol.

Referring to terms ‘website’ and ‘Web pages’ in official documents:

Oxford English dictionary uses the term ‘website’ as in shown here. The initial capitalization of ‘w’ is not required. Term ‘Web page’, however, is denoted with separate Web and pages and at places with a hyphen between the two words. Both with and without hyphen versions can be used.

Oxford English dictionary, however, recommends capital initial alphabets for Internet, World Wide Web and Web.