Kosher Facility

Could you please explain what does it take for a restaurant to be “kosher,” other than the obvious? Does the restaurant have to be “inspected” regularly? Is there a restaurant hechsher posted somewhere? Who certifies the restaurant’s bona fides? Does a Jew have to supervise or work there and, if so, does he (can the person be a “she”?) have to be in the kitchen, and what is this “official” person “required” to do? Does the restaurant have to employ any Jews? Does it have to be owned by a Jew? I am certain I have lots of questions I don’t have the time to think of…