It’s a network of developers approved by Shopify and merchants. Anyone can build an app that will enhance stores’ functionality and sell it in the Shopify App Store for others’ access.
Apps are divided into public, private apps, and sales channels.
Public apps are developed for many stores to use. Everyone with access to Shopify App Store can use them for their businesses.
Private apps are built exclusively for your needs and requests. They can allow you to increase your revenue, add new services to your store, and improve your business’ efficiency.
Sales channel apps are used to reach new customers via different distribution channel inside and outside Shopify. With such a tool, you can link your store to a marketplace or other brand stores you’d like to use and conveniently manage your sales.