What kind of companies does Y Combinator accept? How to get into YC?

Are you a startup company applying to Y Combinator (YC), the famed accelerator that created Stripe and Pinterest? Do your research! While there seem be many YC companies, YC has a high bar, especially when it comes to founders credential, technical know-how and business model. You can research and see all the Y Combinator (YC) Companies by batch number (class number) and year, and their startup ideas http://yclist.com/.