A United Nations resolution (or UN resolution) is a formal text adopted by a United Nations (UN) body. Although any UN body can issue resolutions, in practice most resolutions are issued by the Security Council or the General Assembly.
The legal status of UN resolutions has been a matter of intense debate:
It has been proposed that a binding triad of conditions — a supermajority of the number of nations voting, whose populations and contributions in dues to the UN budget form a majority of the total — make a General Assembly resolution binding on all nations; the proposal has gone nowhere.
For more information on specific resolutions, see:

Most experts consider most General Assembly resolutions to be non-binding (Articles 10 and 14 of the UN Charter refer to General Assembly "recommendations"); however, some General Assembly resolutions dealing with matters internal to the United Nations, such as budgetary decisions or instructions to lower-ranking organs, are clearly binding on their addressees.
Under Article 25 of the Charter, UN member states are bound to carry out "decisions of the Security Council in accordance with the present Charter". It has been debated what kind of Security Council resolutions are covered by this provision, in particular whether it only covered Security Council resolutions adopted under Chapter VII of the UN Charter ("Action with Respect to Threats to the Peace, Breaches of the Peace, and Acts of Aggression"). The International Court of Justice determined in its 1971 'Namibia' advisory opinion that the binding effect of Security Council decisions is not limited to resolutions adopted under this provision.
United Nations General Assembly Resolution
United Nations Security Council Resolution