Oracle SCM (Supply Chain Management) Cloud is a comprehensive suite of supply chain applications that helps businesses of all sizes manage and improve their supply chain processes. It includes modules for procurement, order and inventory management, logistics, manufacturing, product lifecycle management, and more.

Web services, also known as APIs (Application Programming Interfaces), allow these modules to interact with external systems. In the context of Oracle SCM Cloud, web services enable you to integrate the Oracle SCM Cloud with other software applications or systems, whether they are other Oracle products, third-party applications, or custom-developed software.

Oracle SCM Cloud web services can be classified into two main categories:

1. SOAP Web Services: These are traditional web services that use the SOAP (Simple Object Access Protocol) standard for communication. SOAP is a protocol that allows programs running on different operating systems to communicate with each other via the internet.

2. RESTful Web Services: These are newer web services that use the REST (Representational State Transfer) architectural style. RESTful web services are simpler and use HTTP methods directly (like GET, POST, PUT, DELETE) for communication.

For both types of web services, Oracle provides a Web Services Description Language (WSDL) file that describes the operations and data types the service supports. The WSDL file is used to generate client code in a variety of programming languages, which can then be used to call the web service.

Furthermore, these web services include but are not limited to:

• Order Management Web Services: These allow you to create, retrieve, update, or delete sales orders.

• Inventory Management Web Services: These allow you to manage your inventory, including items, quantities, locations, etc.

• Procurement Web Services: These allow you to manage purchase orders, requisitions, suppliers, and more.

• Logistics and Shipping Web Services: These provide capabilities related to shipping, receiving, and other logistical operations.

It is important to note that the use of these web services usually requires appropriate security measures such as authentication and authorization. Oracle provides different ways to secure these web services like using WS-Security for SOAP web services and OAuth for RESTful web services.