How is Cash different from Coins? How to earn Cash?

I see CityVille has both Cash and Coins. I know how to earn coins (rent, business, etc.), but I don't see an option to gain more Cash. There are things I can only buy with Cash.

Only way I know to gain Cash is when moving on to next level. Can somebody please explain to me how it differs and the means of earning Cash?


City Cash is how they get you. It's just an alternate currency besides the Coins, and there are only 3 ways of getting it:

  1. Leveling up
  2. Completing certain out-of-game offers for Zynga ("Earn City Cash" tab)
  3. Buying it with real money ("Add Coins & Cash" tab)