Odoo is business application software that provides integrated modules for sales management, purchase management, warehouse and inventory management, accounting, human resource management, and project management. It allows users to manage customers, sales, purchases, inventory, employees, accounting, and projects. Additionally, Odoo offers reporting and business intelligence features, multi-company, multi-user, multi-currency and multi-language functionality, and integrates sales, purchases, inventory, HR, accounting and e-commerce.