Oracle Cloud Marketplace is an online store—a one-stop shop—selling hundreds of business apps and professional services that complement your existing Oracle Cloud implementation.

All apps and services on the marketplace are offered by approved, registered, and expert partners and developers. Plus, Oracle has vetted, reviewed, and approved each product.

Oracle Cloud Marketplace:

• Offers a large collection of trusted and innovative apps in many business categories, including marketing, sales, customer service, social, and talent management.

  Like add-on or plug-in software, these apps provide enhanced functions or customizations for your existing Oracle Cloud implementation.

• Offers an assortment of services, such as consulting, implementation, integration, and training, to help you transition to the cloud and improve the successful operation of your company.

https://docs.oracle.com/en/cloud/marketplace/marketplace-cloud/index.html