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When there is an impact of two bodies during a short duration of time, an equal and opposite force is exerted by one body on the other.  In such a context, the product of Force and time duration is called the impulse of the impact or collision.

Impulse = Force * Δt  = ( Δp / Δt ) * Δt  =  Δp
         where p  = momentum  and Force is rate of change of momentum.

 Hence, impulse is the change in momentum of the bodies when a collision occurs between them during a very short period of time.

S.I.  unit is same as the unit of momentum:  kg-m/sec  or  N-sec

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