Page
When we talk about computers, a page is also a common abbreviation in net jargon for "webpage".  Here the page is not paper, it is a piece of information which we can see on a computer monitor at one time.  We can print it to make a real page.  But the information may not fit all on one page, and we can not change it when it is printed - we can change a web page.  So a webpage is not always the same even as a printed copy of that page.  This is a conceptual metaphor.  It can be confusing.  Someone who uses it is also likely to use other jargon.