“Wage and Hour” is a broad heading which covers the following issues, among others:

There are many questions which involve wage and hour issues for both employees and employers.   Making sure that an employee is paid correctly is critical for both parties. Employers need to be sure that they are doing it right not only because it’s the right thing to do but also because the legal and financial consequences for doing it wrong can be very costly.

The above links provide a brief overview of these areas.  They are, by no means, comprehensive description of the issues or law which is not only extensive but also varies a lot depending on the facts of the situation.