“The state of a reversible chemical reaction in which the rate of forward reaction becomes equal to the rate of backward reaction in called chemical equilibrium/Dynamic equilibrium”.
OR
The state in which both reactants and products are presents in concentration in which no further tendency to change with time.
Examples:
Change of a liquid to gas in a closed container:
When liquid water is placed in a closed container at constant temperature, part of liquid evaporates. As water begins to evaporate, at the same time, some of the vapours also begin to condense. Although in the beginning rate of evaporation is faster than the rate of condensation but with the passage of time the rate of evaporation becomes equal to the rate of condensation and thus a state of equilibrium is established.