- B2B, the business of selling a product or service to another business, - B2C, the business of selling a product or service to the public, - C2C, when a person sells a product or service to another member via a website, E-commerce, electronic commerce when people buy and sell goods and services using Internet, - M-commerce, the buying or selling of goods via mobile devices, - Confirmation, - something telling you that something is true or will happen, - Gateway, an entrance to another computer network, - Rejection, the act of not accepting, - Authentication, proof that something is true or real, - Encrypt, to protect information by putting it into a special code, - Perimeter, the boundary between the public part of a network and the private part.

Unit 5

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