Sales channels are the interface between your administration and the storefront. Here you can create a separate sales channel for every channel through which you want to sell your products. Besides an online shop, this could also be the connection of an ERP system that is linked directly to your local store.
ThemeWare® tip: Give every sales channel its own look: with ThemeWare® design variants you can change your shop's character with a single click – five variants are included, ten more can be unlocked as an add-on.
Further information
Please find more information regarding "Sales Channels" in the official Shopware documentation:
Shopware documentation: Sales channel