The concept of « offer » is simple: a website offers goods, services, software, membership in the site, etc., and this offer is included for this article in some kind of agreement that will be published on the site. The online contract is concluded by new means of communication such as e-mail, Internet, fax and telephone. The requirement of essential elements such as offer and acceptance in the context of online contract formation is as important as for the creation of a traditional paper-based contract. Entering into a contract on websites is very different from previous ways of creating a contract. The conclusion of an online contract raises above all questions concerning the applicability of the rule of offer and acceptance. It is the site that acts as a retailer and reacts in accordance with the action of the consumer. .