What is the difference between a brand-name and a generic product?

The name of the company that manufactures the product.

Some generic products, rightly or wrongly, are perceived to be inferior to the Brand name product.

The Brand name product is usually made by the company that first made it and either developed a great reputation or had a great reputation.

In fact, another company could come along long after the Brand name product was introduced, make a minor dimensional or material change for example, and offer a better version of the same product. Of course they could just as easily produce an inferior product. At that point Brand Image would become a factor.