What Supply chain management is
A subset of value chain management, it is an old system that's been updated with new technology. It specifically refers to the relationship between a supplier and a retailer. For example, a major retailer can monitor surplus on its shelves right down to an individual product, and this enables the retail store to keep its supplier aware of how its product is selling. In return, the retailer may demand favorable promotions from the supplier.
The meaning of Commerce
In general it means to conduct transactions online. It is considered a technological term because any kind of commerce conducted online requires a technological application behind it. From a marketing point-of-view, commerce is discussed with reference to the three big C's: content, commerce, and community. These are thought to be the three components driving the new economy.