Netiquette comes from the combination of network and etiquette.  It is the code of the internet because the internet is a network and etiquette is a code.

The basic rule of netiquette is to use good manners.

Netiquette Article

10 Core Netiquette Rules

1. Spell check & proof read before sending or posting because errors make you look uneducated.
   Spell Check & Proof Read
2. It is not polite to shout. Do not use all caps because it is shouting. Do not use all caps
3. Tell the truth in your profiles to create the best experience. Tell the truth
4. Do not say or do things online that you would not do in reality. Be yourself
5. Do not flame because it gives you a bad reputation. Do not flame
6. Stay away from spam and pop-up advertising for security reasons. Stay away from spam
7. Be conservative in e-mail you send and liberal in what you receive since quality is better than quantity.
   Be conservative
8. Do not send e-mail late at night because it may call your lifestyle into question.
   Do not send e-mail late at night
9. Shop secure sites because they protect your information. Shop secure sites
10. Anything on the internet can be found because everyone uses it.
    Anything on the internet can be found