An induction electric motor or 3 phase induction motor can be an AC electric Three Phase Motor engine in which the electric energy in the rotor had a need to create torque is obtained by electromagnetic induction from the magnetic field of the stator winding
An induction electric motor which connects with a 3-phase supply called 3-phase induction motor. Example followers,blowers, cranes,traction .It is a ac motor. The main drawback of DC motors may be the existence of commutator and brushes, which require regular maintenance and we can not use DC electric motor in explosive and dirty environment. But induction motors are cheaper,rugged,lighter,smaller,require much less maintenance and may use in filthy and explosive environment. Slide s is the imp element in this kind of motor.
There are 2 types of IM.
Squirrel cage 
IM
Slip ring IM
There are many starting and braking condition.
Important starting methods are
Star-delta starter
Auto transformer starter
Ac voltage controller starter
Rotor resistance starter
Important braking methods are
Regenerative braking
Plugging or reverse voltage braking
Dynamic braking
But one thing swiftness control technique of induction motor is important
Pole changing
Stator voltage control
V/f control
Slip power recovery
Rotor resistance control