Can someone please explain me reversible and irreversible process ( in thermodynamics) ??

In thermodynamics, processes can be carried out in one of two ways: reversibly or irreversibly.
Reversibility in thermodynamics refers to performing a reaction continuously at equilibrium. In an ideal thermodynamically reversible process, the energy from work performed by or on the system would be maximized, and that from heat would be minimized; heat cannot fully be converted to work and will always be lost to some degree (to the surroundings).
An irreversible process can be described as a thermodynamic process that leaves equilibrium. When described in terms of pressure and volume, it occurs when the pressure or the volume of a system changes so dramatically and instantaneously that the other (pressure or volume in this case) does not have time to catch up.