When you're just starting out, you probably don't need a CRM. A notebook, a spreadsheet, a whiteboard will probably do the trick. But at some point, you'll come to the conclusion that you need some way of staying organised. A central repository for this information. And you'll hear that a CRM is the best way to do this, so you'll get on the phone to your friendly CRM consultant, they'll give you a quote and you'll faint.