In order for a treaty to go into affect it must be approved by?

In order for a treaty to go into effect, it must be approved by the governing bodies of the countries involved, typically requiring ratification by the national legislature or parliament. In the United States, for example, a treaty must be ratified by a two-thirds majority in the Senate. Additionally, the treaty must also be formally signed by the heads of state or representatives of the countries. Once these steps are completed, the treaty can be implemented according to its terms.