What is the difference between a C-corp, an S-corp and an LLC?

C-Corporation, S-Corporation and Limited Liability Corporation are the three types of legal entities you can form with your new startup.  Each have different implications from a liability, ownership, management and taxation standpoint. 

Goodwin Procter's Founders' Workbench has a fabulous article clearly explaining all the considerations that go into choosing the type of legal entity for incorporation.