Maybe the someone who told you could tell you some more, if you asked them. There's not much to go on in your question.

E-commerce is a general term for doing business online. Some E-commerce solutions I guess would be things like shopping carts and merchant accounts. If you need a shopping cart check out zen cart, it's completely free.

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Also you can check out Core Frameworks. There's a Lite version which is free (the second link in my sig)