My opinion about email 

 It is important thing in our life because every things go fast. For that it is useful for us to use email rather than mail. we can send our assignments , ask teacher about lectures and more things. The important thing to put in your mind the internet not secure and anyone can attack your email . A lot of hackers use other's emails in bad way. you should be careful and protect password to avoid hacking. 

For more information...http://en.wikipedia.org/wiki/Email_privacy