Shows your products side by side, in slides, product grid, etc. This is most important for businesses that have browsing customers, for example, people that come into a clothing store and browse around to find the right product for them, now in that sorts of case it’s important to show people as many products as you possibly can on the screen to give them as many options as possible.
This means that they can show you double as many products on the screen as if it was one wide, on desktop, they expand this and make it full screen, which is a great way of showing as many things as possible. Now, the goal of this obviously, is that something catches your eye and you’re clicking through into the product page.