'cc' normally refers to the volume of the engine cylinder in cubic centimetre (cc) of a vehicle in this context.

Eg: Maruti 800(800cc), TVS 50(50cc)

This cc value indirectly represents the power of the vehicle. How???

Amount of fuel-air mixture compressed in an engine cycle = Volume of the engine cylinders = cc of the vehicle.

The more the fuel burnt in a cycle, the more the explosion and heat generated, the more the power of the vehicle.

When the cc is large, the power is more and so you will have a quick pick up in starting and accelerating the vehicle. and so speed will be high for the vehicle with higher cc whereas the mileage will be low for these vehicles. Because more volume of fuel is utilised in a single stroke of piston owing to the large volume of the engine cylinder.

Coming to torque,

Torque is nothing but the load carrying capacity of the vehicle. More the torque more the load the vehicle can carry.

Torque is more or less related to the speed and the gearing system of the vehicle .

In a vehicle with gears, the first gear usually provides high torque but low speed, as the gears increase to fifth gear it provides low torque but high speed.

The torque required to move a vehicle from rest is high that's why we are using first gear to start the vehicle.

This explains, consider driving a bicycle initially when you start the cycle from rest you need to put more pedal effort than the effort you put when you are moving in a constant speed.

When the speed is low torque will be more and vice versa.