The UNO Security Council plays a Prominent (important) role.

1)       The Security Council occupies an important place in the constitution of UNO.
2)       The main task of the Security Council is to discuss any issue disturbing international peace, punish the disobeying nations and offenders of peace with the help of military force form other member nations.
3)       It also grants permission to the new membership.

4)       Thus, Security Council is the heart of UNO as it has the real strength.