Torque is defined as the rate of change of angular momentum of an object. The definition of torque states that one or both of the angular velocity or the moment of inertia of an object are changing.
The formula for Torque acting on a body is given as,
Torque (τ) = moment of inertia (I) × angular acceleration (α)
→ →
τ = I x α
where τ = Torque
α = angular acceleration
I = moment of inertia
S.I. unit of torque is Newton metre (Nm)