When do you use e-mail?

What purposes do you use email?
The purposes that i use email for;
1.I use email to send important work files to people, also I use email to send important information to contacts that I do not have any other contact information.
2.I use email on any computer at home or at college, I use it by logging into an online internet account which then can enable me to send and receive emails.
3.The major benefits of using email is that email is very quick it will get to the contact email address very quickly. Also emails are free of charge to send.
4.The problems/disadvantages of using email is that email can only be used or accessed or used if you are connected to the internet. Also you can only send a email to someone if you have there email address.
5.Email makes you more productive when you have to send out important information and important files to other accounts.
6.Email makes you less productive because some people may not reply to the email instantly, where as with voice communication the person is instantly replying.
7.Emails fulfil its purposes by it being able to exchange information and files to other people and files.