商业（Commerce），是一种有组织的提供顾客所需的商品与服务的一种行为。中文之“商业”含义指社会分工出现的有组织的贸易行为，现代概念指流通领域的所有产业，多与贸易合称“商业贸易”。大多数的商业行为是通过以成本以上的价格卖出商品或服务来营利，如微软、索尼、IBM、联想、通用都是营利性的商业组织典型的代表。然而某些商业行为只是为了提供运营商业所需的基本资金，一般称这种商业行为为非营利性的，如各种基金会，以及红十字会等。

一般认为商业行为成立的条件有以下几点：

Commerce is the activity of buying and selling of goods and services, especially on a large scale or quantity. The system includes legal, economic, political, social, cultural and technological systems that are in operation in any country or internationally. Thus, commerce is a system or an environment that affects the business prospects of economies. It can also be defined as a component of business which includes all activities, functions and institutions involved in transferring goods from producers to consumers.