Odoo is one need one app enterprise solution, Where the user can scale the system as they grow. As a result, odoo Integration is needed when the user need some integration with other third party application or hardware devices. However, the beauty of the Odoo ERP opensource customizable solution is that most of the integration apps are coming in out of box.
But, still in rare cases the users need to integrate the solution with odoo ERP to bring everything under single window. Moreover, this brings more productivity to the enterprise and reduces the manpower costs.
In addition, most common integrations are bio metric device integrations, payment gateway integrations, delivery system integrations, eCommerce system integrations, web service api integrations etc.