Businesses Oracle is in:

- Databases (several)

- Cloud

- Software for planning everything related to manufacturing and logistics (ERP, supply chain management)

- Software for customer relationship management (CRM)

- Software for healthcare, managing hospitals and clinics

- Software for managing every aspect of running a bank

- Point of sale equipment

- Software for running utility companies

- Software for everything people related inside companies (payroll, HR, hiring, etc)

- Competing with Red Hat on commercial Linux

- Programming languages (several)

- Software for managing inventories

And a gazillion other things.