A more thorough explanation:

Interstate trade refers to the exchange of goods and services between different states. It is a type of commerce that involves transportation of goods and people across state lines. This is different from intrastate commerce, which is commerce that takes place entirely within the borders of a single state.

For example, if a company in California sells products to a customer in New York, this is considered interstate trade. Similarly, if a person from Texas travels to Florida for vacation, this is also considered interstate trade because it involves the movement of people across state lines.

Interstate trade is an important part of the economy because it allows businesses to reach customers in different parts of the country and provides consumers with access to a wider range of goods and services. It is regulated by federal laws and is subject to taxation by both the state of origin and the state of destination.