Website
2
This is exactly what you are looking at right now. A collection of several web pages is called a website. It is commonly abbreviated as "site".
A website (webサイト) is a collection of files (web pages) written in a format such as HTML. If you have an internet connection, you can view them by using a browser.
In Japan, it is also called homepage (HP), but strictly speaking, this is a misnomer.
The tag "site" mostly refers to personal sites established by pixiv users.