Each URL points to a 'Web Page' which can contain text, graphics, animation, sounds, etc. The main difference is the speed at which the mail is delivered.
Email is very fast.
In many instances it is almost instantaneous. Your Email address is usually assigned to you by your Internet Service Provider. It may contain your name or it might be randomly generated. Newsgroups are electronic forums where people can exchange ideas and information. Unfortunately many of the newsgroups now contain a lot of commercial advertising.