e-Commerce is not only or does not only mean transacting online. To put it in simple words it is basically interaction of people with a system. By interacting with a system they learn and understand as to how the particular system works. Once a user starts interacting with the system he starts developing some kind of trust in the system and confidence that the system would react in the expected and obvious manner.
Then slowly with time he would get to know the parameters, behavior and risks being involved with the same. But all of this can be achieved once there is frequent interaction between the user and the system. Since e-Commerce is a combination of both the system and the user a certain kind of understanding to some extent can really help. This could be termed as to building of trust in the system that is an enabler for e-Commerce.