You can use .html, .htm, .asp, .php, etc as your URL file extension.
I wanted to ask if search engines prefer one of these over others.
Thanks in advance !
________ CiaraDarling
If your website is updating regularly then google will not bother for your extension and if you are not updating it regularly then you will never get top of the SE . So, you don't have to think of this.. You can use any extension..