Oftentimes people install WordPress in a subdirectory of the main website. One-click installers like to do this. Say your domain is http://example.com, but WordPress lives in http://example.com/wordpress. By default this means that people will have to visit your website at the latter URL.
But what if you want your URL to be http://example.com, without that /wordpress at the end?
No problem I say – let me talk you through it. It may sound scary, but that’s just because we have to do some tweaks to files we don’t normally touch.