Light switch with one red and two black wires. Dont think it's a three way
You have a 2-way switch.   One of the black wires is probably the line and the other carries power to some other device on the circuit; they are connected together by one using the backstab connector and the other the screw.   The red wire is probably the load (it's also possible the red is the line and you have two loads controlled by the switch).