What is the most important difference between a treaty and an executive agreement?

Difference between Treaty and Executive agreement:

1. Treaty agreement:

Treaty is a formal written agreement entered into international law, namely in sovereign states and international organizations.

2. Executive agreement:

Executive agreement refers only to the statement of agreement within the domestic law of the state.

Important differences between treaty and executive agreement is treaty is a part of the supreme law of the land according to the supreme court. Executive agreement is merely understood between two heads of state.