Inventory

Inventory is the amount of products you offer to your customers. These products are catalogued and divided into items that are in stock and reserved. The stock value is the physical amount of products you have in your warehouse, whereas availability is an aggregated value per store which reflects current quantity of products taking into account reservations, i.e. open (reserved) orders.

With the Inventory Management feature you can:

Developer Store Administrator Migration Guides
Learn what the Stock module does and how it works Manage products availability from the Administration Interface Migration Guide - Availability
Learn how product availability is checked and calculated   Migration Guide - OMS
Import stocks into database    
Configure multi-store availability for various scenarios