commerce is a part of business activities. it includes two types of activities viz:
(i) trade and
(ii) auxiliaries to trade.

(i) Trade: Buying and selling of goods is termed as trade. 
(ii) Auxiliaries: There are a lot of activities that are required to facilitate the purchase and sale of goods. These are called services or auxiliaries to trade and include transport, banking insurance, communication, advertisement, packaging and warehousing.

Commerce, therefore, includes both, buying and selling of goods i.e. trade as well as the auxiliaries such as transport, banking, etc. Commerce provides the necessary link between producers and consumers.