Every single action of leads get tracked and scored with points. Leads with higher scores are closer to a buying process and more ready to talk to you.
Page views and form submissions are scored differently because they represent different levels of interest towards your offering. The score is aggregated in real time so you can see the level of activity of a given lead at a quick glance. The more points a lead has, the more likely this person is ready to talk to a sales representative and initiate a buying process.
Score becomes really useful when you compare several leads. With Beagle it is very easy to identify which leads are "hotter" or have had more engagement from your company. Pick those first and call them. Those that don't have as many points need more time, but if you do the right marketing, they will soon be ready to talk to you!