Commerce

com·merce/ˈkämərs/noun

1. the activity of buying and selling, especially on a large scale.”the possible increase of commerce by a great railroad”Similar:tradetradingbuying and sellingbusinessbargainingdealingtraffictrafficking(financial) transactionsdealingsnegotiationsmerchandising
2. [DATED] social dealings between people.”outside the normal commerce of civilized life”
3. [ARCHAIC] sexual intercourse.

Merchandise – mid 16th century (in commerce (sense 2)): from French, or from Latin commercium ‘trade, trading’, from com- ‘together’ + mercium (from merx, merc- ‘merchandise’).

E-Commerce

e-com·merce/ˈēˌkämərs/noun

1. commercial transactions conducted electronically on the Internet.

eCommerce (also known as electronic commerce) is the process of buying and selling of products or services, making money transfers, and transferring data over an electronic medium (Internet). This network allows people to do business without the constraint of distance and time.

Conclusion

Commerce (AKA Communication) is the exchange of words, images, sound, video, or diagrams between two or more parties.