What is constipation exactly, ways to help it?

I was wondering, is constipation when you feel like you have to go but it wont come out, or if you just don't feel like you have to go at all?

Can be both. Constipation occurs when the colon absorbs too much water or if the colon’s muscle contractions are slow or sluggish, causing the stool to move through the colon too slowly. As a result, stools can become hard and dry.

Treatments:
More Dietary fiber in your diet (like metamusil supplement)
Proper exercise and diet (including fresh fruits and veggies!)
Laxatives, enemas, suppositories if it gets too bad and you need a little 'help'