To have a Google Voice account you do not need a domain. What you DO need is a Gmail account or Google Account. You will also need a US phone number.
Google Apps allows you to add your existing domain name to their Gmail service. You can then route your email address (keeping the @yourdomain.com addresses) through the Gmail service. There is a free trial version but for the full service there is a fee.
www.gmail.com
There is no direct link from Gmail to Google. You can insert in the URL bar to go to Google. Gmail itself is a product of Google.
The domain of Gmail is .com. It operated worldwide so can't rely on a local domain. .Com is the most widely used domain.
G in gmail stands for = Google
Yes, you can. You need to use Google Apps for that! The you'll have email ids like info@answers.com[info@answers.com is used as an example here, I don't think they use Google Apps]
Gmail is short term for google mail. It is email run by google. So technically it's email with less spam and junk.
Probably because Gmail sounds cooler than google mail. Gmail is a play on the word Email of course, and I have always like the name a lot. and for example im john smith and my email is johnsmith@gmail.com its nice and quick for people to type. It is also shorter to type than google mail than Gmail.com
Gmail and Google account are the same thing. The account created for Gmail can be used for Google. It is because Gmail itself is a a part of Google.
Google Created Gmail.
Google is the owner of Gmail.