International law refers to the customs, norms, principles and rules that establish binding obligations among states and other international actors. The main sources of international law are conventions, treaties, customs, and judicial decisions. However, international law has weaknesses as well, such as vague obligations from treaties, lack of an effective legal enforcement system, and powerful states' ability to ignore laws that conflict with their interests. Nonetheless, international law still has enduring value in that states usually comply due to identity, self-interest, or fear of reprisals, and it can shape norms and identities over time.