Computer etiquette is the proper way to communicate while interacting with people online. Whether it's done in an email, a chat room, a forum or a blog, there are certain things to keep in mind to ensure that what an individual writes is understood and non-offensive.
One example of computer etiquette is to never use all capital letters. Communicating with someone using all capital letters is akin to yelling at that person, which is considered rude and an inappropriate way to communicate with someone online. It's also important to use proper spelling and punctuation with all online communication, otherwise the writer will appear uneducated and careless, in addition to not getting his or her intended message across.