For example, I'm looking at sleeping pads for camping. If I type "sleeping pad" in ChatGPT, it tells me what a sleeping pad is. If I type it into Google, it lists products, places to buy them, and some reviews. If I type "best sleeping pads", ChatGPT gives me a list but without details or sources. If I type into Google, I get a list of reviews which I have to read but has context.
Following your example, I queried it with "Where can I buy a sleeping pad online?" and it listed several options, starting with specific ones (Amazon, REI, Backcountry), then got more generalized (Camping and Outdoor Gear Websites, Specialized Brands, Large Retailers, Online Marketplaces). I told it to list the websites of the specialized brands and it gave me links to four retailers (thermarest.com, bigagnes.com, seatosummitusa.com, and nemoequipment.com)