A cylinder, yep.
Actually lots of other things too, depending on what you call a single curved side. Any two (non-intersecting) planes through a sphere make a "fat cylinder." Think of others, there's more.
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Soda can or cylinder
A cylinder.
The cylinder only has 2 faces which are flat but the sides are curved.
The top and bottom flat surfaces (the 2 circles or ellipses) and the curved surface make up the 3 surfaces.
When you say "What face" did you mean "What solid" has one curved face and two other flat faces? A solid that can be imagined is a melon wedge, cut from a sphere. Two flat faces come from the two cuts with a knife, and the one curved face that formed the rind. If you did not mean "What solid" then that makes your question unclear. I cannot imagine a face made from three other faces. Perhaps a face made from three other lines with one of them curved? It would seem you used a word wrong somewhere in your original question.