A store brand is produced and marketed by the company’s selected manufacturing companies. A store brand is often cheaper and just as good as the name brand items. Medicine is a good example of this; you could buy the name brand (long and hard to say sometimes) for Excedrin, but it’s the same as the acetaminophen next to it in the same green packaging.
There are a few times when this is not the case - often you want to buy a name brand you’re familiar with if you don’t trust a store brand. One such case is, actually, computers. A trusted name brand is often better quality than a cheaper, unknown “in store” brand. Otherwise, the name brand is often just as good as the other stuff.