To be simple scrap is something valueless. Odoo scrap management is a very simple but eminently useful feature of Odoo manufacturing ERP. In the company stockroom, you once in a while discover items that are unusable because of expiry or for some other reason.
You regularly see this during physical stock. Since you can’t sell or store these items, you need to scrap that. In Open ERP/Odoo scrap management, you can create one or more scrap locations for scrap Products In Odoo Inventory. This video explains 'How to scrap products in Odoo 15'.