Bills must receive a majority vote from both houses. This can be especially difficult feet to achieve, thus encourages a process of log rolling. In the context of legislation, logrolling is the exchange of vote for vote.
We are in favor!
You better vote for my tax reform bill...
A president can sign a bill into law, veto the bill, or pocket veto. The pocket veto is withholding a bill till after congress finishes session, thereby killing a bill without giving an official answer.
Mr. President what do you think of this bill?
I think my approval ratings are at an all time high. I meant to say the Apprentice, I heard its a very tremendous show as they say. Oh not that. Veto!
Wait he vetoed?! But wait! It's not over. With two-thirds of both houses to approve, congress can override a president's veto, granted this rarely happens because of the strict divide between parties
With that, you have the legislative process. A complicated series of events that turns an idea to the law of the land.