A more thorough explanation:

A commercial treaty is an agreement between two or more countries that concerns trade or other business activities. It can be a general agreement that sets the framework for long-term commercial relations or a specific agreement that details the conditions of particular branches of trade or other commercial transactions. Sometimes, a commercial treaty deals with an individual project, such as a guaranty agreement.

For example, the North American Free Trade Agreement (NAFTA) is a commercial treaty between the United States, Canada, and Mexico that eliminates tariffs and other trade barriers between the three countries. Another example is the Trans-Pacific Partnership (TPP), a proposed commercial treaty between 12 countries that aims to deepen economic ties and boost trade.

Commercial treaties are important because they help to promote economic growth and development by facilitating trade and investment between countries. They also help to create a more stable and predictable business environment by establishing clear rules and regulations for commercial activities.