Posted by: This question is from Sryan who gave his e-mail address. Of course Sryan there is an article of this very subject on the web design directory here https://www.web-design-directory-uk.co.uk/blog/category/domain-names-hosting
However, Saroj,
I do feel the directory article https://www.web-design-directory-uk.co.uk/blog/2011/01/18/choosing-a-website-name/ will explain more than I could write here.
One would then go to a website such as www.uk2.net and search to see if your name is available. If this doesn’t answer your question please refer back and I’ll do my best to help.
Good luck