Still the inverted acronyms exist as G2B and C2B that they represent the inversion of who vende and who purchase and variations as E2E and G2G that complete the possible relationships. 2 if relates to the physical connection between the participant and web, on nets for wire were used and today if it can have access the Internet and all its types of services through cellular telephones and other portable digital applications without wire. The use of this type of device calls mobile Commerce (m-commerce). Although all this easiness that I approached with made research, still exists certain distrust of many customers in making transactions for the Internet, which had to the innumerable cases of robbery, security lack, therefore laws for it do not exist deal electronic that assure digital document validity that can be copied, contracts saw email can not be safe, electronic signatures can be counterfeited etc. But still the biggest problem is to know the law of that parents to apply (of that one where this the manufacturer? The server? Or the customer). Security and Privacy also are challenges, therefore important information as personal data, elaboration of a product. the case. they pass for diverse systems of computers before arriving at the destination and can be copied, be monitored, be stored in any point of the route, being used for fake questions of competition, robberies. These processes to the times occur without wanting through the systems of tracking used to get automatically given of customers without they have q if to register in cadastre, but also can be carried through propositalmente by Hachers, vandals and criminals of the computer science that to the times receive money in exchange to carry through the espionage. Exactly with all these fears, we go to use to advantage the benefits that the Internet and YOU bring in them, and being known to use of the correct form, with certainty we will obtain good results.