Why does Aldi have knock off brands?

I'm curious, could you elaborate on the reasoning behind Aldi's decision to carry knock-off or own-brand products? Is it a cost-saving measure for the retailer, or is there a strategic advantage in offering these alternatives to name-brand goods? Does Aldi believe that their own-brand products offer comparable quality to the more recognizable names on the market, or is it a matter of catering to a specific consumer demographic that values affordability over brand recognition? I'm eager to understand the motivations and potential benefits behind this business strategy.