It has been popularized by Sarbanes Oxley Act (google it). Basically, companies have to prove they have controls over the information that makes it to their financial statements, so that people who rely on financial statements can have a 'reasonable assurance' that the data is correct.
Also, each company will have internal IT Auditors that test programs, the network, interfaces, and general computing controls like access and backups for the benefit of management that IT is being run properly.
Spidey07 sounds like he has to work with auditors
Generally as an IT auditor you will be asked to have an IT background/education, but since auditors generally touch many systems in their audits, it is pretty much impossible for an auditor to be an expert on every system. People generally don't like working with auditors because it is arduous and they get 'dinged' for systems passing a checklist of tests that may or may not be the focus of the technology piece. In short, very frustrating. If you want to be an auditor, try browsing
www.isaca.org and
The institute of internal auditors .