It is exchange of capital, goods, and services across international borders or territories. In most countries, it represents a significant share of gross domestic product (GDP).
The International trading economic, social, and political importance has been on the rise in recent centuries. Industrialization, advanced transportation, corporations, outsourcing globalization and multinational are all having a major impact on the international trade system.
International trade is a major source of economic revenue for any nation that is considered a world power. Without international trade, nations would be limited to the goods and services produced within their own borders.
The principle of International trade is not different from domestic trade as the motivation and the behavior of parties involved in a trade does not change fundamentally depending on whether trade is across a border or not. The main difference is that international trade is typically more costly than domestic trade. The reason is that a border typically imposes additional costs such as tariffs, time costs due to border delays and costs associated with country differences such as language, the legal system or a different culture.
Posted by riya13 
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