"A website is a presence on the World Wide Web (...), a collection of Web pages (files) coded in HTML that are linked to each other and to pages on other sites. A website is run (hosted) on a Web server by the site's owner, a Web hosting provider or an Internet service provider (ISP)."
"A "portal" is a website that covers a topic or industry, while "search engines" are sites that index all the content on the Web. "Social networking sites," "blogs" and "wikis" are sites that contain user-generated content. An "extranet" is a password-protected website for subscribers or business partners."
Source: PCMag