www.google.com
You can obtain someone's Gmail address from a Google Plus reply link by simply following the link to his profile.
The chairman of Google (and Gmail which is a branch of Google) is Eric Schmidt. I will attach a link to a list of the rest of Google's executive staff.
You cannot link without having Gmail. Gmail is the most necessary part of linking. It is because of the account that the link happens.
You can obtain a Gmail address from a Google Plus ID, by following the accompanying link.
You can get your password back if you forgot it. Google provides a link for that on Gmail page. You have to follow some steps for it.
You can add large files in Gmail. This can be done via Google Drive. The drive attaches it as a link or as an attachment.
G in gmail stands for = Google
Gmail is short term for google mail. It is email run by google. So technically it's email with less spam and junk.
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.
You can get gmail by going onto the Google browser page and click the gmail link in which it has an email sign in. underneath this should be something that says "dont have gmail? click here to make an account" which you click and it will ask you questions and you answer them and you will have a gmail email.
You do not have to use Gmail in order to use Google Buzz. However, you do need to use some Google product and make your profile there public. The Google Buzz help page says: "You can read your Buzz from a number of Google products. You can access it through the left-hand links in your Gmail, from your Google Profile, or from a mobile device." Please see the related link for details.