Thanks everyone 
For those who were wondering, computer forensics is a field where people can investigate things like computers, thumb drives, cellphones, etc, for evidence of criminal activity.
Examples of criminal activity would include child porn, e-fraud, harassment/stalking, etc. Other cases may involve people leaving behind a lot of evidence that could be used to build up a good case against them. For example, if someone got accused of murder, the crime itself may not relate much to computers, but that person could have Googled for methods on how to kill people. Or that person could have stored a lot of pictures of his/her victim, notes, e-mails, etc - anything to indicate that the murder was premeditated.
However, not all of it has to be about criminal cases. Sometimes people do hire investigators to search their hard drives and prove that they did NOT do this or that. For example, someone got fired from his job for downloading porn while working. He could try to get an investigator to prove that it was not him who downloaded the porn, but a trojan/virus that did it.
Anyways, after the investigator does all the work on the computer, he or she is also responsible for writing reports on the findings and submitting it to others (i.e. lawyers). The investigator also is responsible for going to court to testify in cases.
There are a lot of other things that computer forensics involves but I gotta stop here. You can google for more information, or I can answer more questions when I have more time.
Cheers.
