These acronyms are really important in the E-commerce world.

E-commerce is an electronically exchanging of products or services. 

B2B:

Business-to-Business: 

Used for describing business activities in which companies sell products and services to other companies rather than directly to the public.

B2C

Business-to-Consumer: 

Used for describing business activities in which companies sell products and services directly to the public rather than to other companies.

C2B:

Consumer-to Business:

Used for describing a type of business activity in which a customer deals with a company

C2C:

Consumer-to consumer: 

Used for describing a type of business activity in which a customer deals with another customer.

Pics taken from: https://www.builderfly.com

 

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