A few things:
1. it secretes insulin, which the body uses to utilize glucose (in the kind of diabetes most people have, their tissues have become resistant to insulin requiring more and more of it to be produced by the pancreas)
2. it produces things called pancreatic enzymes which help us digest foods (especially fatty ones)
3. the other things it secretes are somatostatin which regulates growth hormone, and glucagon which is related to insulin in that it also helps regulate the body's sugar (kind of an anti-insulin)
