In this case the App serves as a platform for buyers and sellers to contact. The users will normally access by means of a previous registration where they must create a profile. They will be able to hang their products to sell, with images and descriptions.
They have an internal communication system for users to contact and reach an agreement.
Sometimes these platforms charge for facilitating access, for advertising or a percentage for sales made.
Examples of this type of apps for sale are Wallapop, Vibbo or even Ebay.
This type of app allows the sale of all kinds of items, although there are always legal restrictions (no sale of weapons, illegal substances, animals, etc.). It is possible to sell used products, new products, handcrafted products, custom-made creations,…