How does a treaty become legally binded?

A treaty becomes legally binding when it is negotiated and agreed upon by the parties involved, followed by signature and ratification. After the negotiation, the treaty is signed by representatives of the states, indicating their intent to be bound. However, for the treaty to have legal force, it must be ratified through each state's domestic legal processes, often requiring approval from the legislature or parliament. Once ratified, the treaty is legally binding on the parties according to international law.