What is veto power?

Veto power is that power in the security council of the UN which has been given to the permanent members of the security council which are also called the Big5 (Russia, USA, the UK, France and China). Theses country involve in discussions in keeping peace between countries and stopping any terrorist attack. If any of the country denied the majority the discussion will not be approved. There are also other countries in the security council but they have no say in the major concerns. Also, the country the security council wants to keep peace in and if any one of the permanenet country dislikes that country for any reason it opposes the decision. So, veto power according to me is not good.