Odoo is a Point of Sale (POS) and Enterprise Resource Platform (ERP) system to help manage small to medium businesses.
You have seen POS systems in stores of every type, usually made up of a printer, cash drawer, LCD panel, scanner, scale, etc. Usually these are VERY expensive and closed source so the user has to go back to the manufacturer for any small change, which costs a lot of money.
Odoo is an Open Source system that has millions of installations and hundreds of commercial companies supporting it, It is a backplane type of system that has many open and free plugin modules with some closed modules for sale. However most small companies can work very well just on the free and open modules.
