You will need two kinds of software if you want to serve pages from your desktop - web page authoring software and web page serving software.

The authoring software is used to create the pages, while the serving software makes the pages available to other computers.

Some people do not wish to serve pages from their desktop - they prefer to publish their pages on another server. They will need only web page authoring software.

Do you wish to serve pages from your own computer?

Yes - show me how to do it

No - go directly to Web page authoring software