A cafe is a small restaurant where drinks and snacks are sold.
The Café des Artistes was a small restaurant situated in Paris, Earth. (TNG: "We'll Always Have Paris")
In 2368, Captain Jean-Luc Picard and Ambassador Spock ate some soup at a small cafe on Romulus, whilst waiting for Senator Pardek to arrive. (TNG: "Unification II")
Jupiter Station had a small cafe. In 2373, it was looking for a new manager. Dr. Lewis Zimmerman, on a visit to Deep Space 9, suggested Leeta for the position, but she declined. (DS9: "Doctor Bashir, I Presume")