Question

what is the purpose of # in HTML code

Answer 1

HTML: Origins and Purpose. The Hypertext Markup Language (HTML) is a standard for describing the structure and presentation of information via the Internet. Scott Loban shows how you can use HTML keywords and tags to format and display the content of Web pages.

Answer 2

Heya!

Here is your answer!
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HTML or  Hyper text mark up language. It is a programming language in which computer programs are written. 

So the purpose of # in an html is the usage and definition. The hash tag sets if returns the anchor part of the href attribute value.

Also the href attribute value specifies the destination of a link in a particular area.

The anchor part is the part of the URL after the #.
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Hope it helps!