If you withdraw the money to your own bank account, you have 60 days to return it, or deposit it to another Roth IRA without any tax consequences. This is a rollover, but you can only do one such rollover per year. (If you do a direct electronic transfer between two plans, you can do that an unlimited number of times per year, but you can only do a rollover where the money passes through your hands once per year.)
If you keep the money, the tax consequences depend on whether the money is from contributions, a conversion, or earnings; and how old you are.
