What term describes software that is often used to integrate different services?

The term that best describes software often used to integrate different services is Enterprise Service Bus (ESB). ESB is an architectural pattern that facilitates the communication between various software applications in a service-oriented architecture.

By acting as a centralized hub, ESB allows disparate systems to communicate seamlessly, enabling data exchange and process integration. It manages messaging, routing, and transformation of data while ensuring that each service or application can function independently. This is essential for modern enterprise environments where multiple applications and services need to work together efficiently.

In this context, while Configuration Management Database (CMDB) relates to the management of IT assets and their relationships, and Service-Oriented Architecture (SOA) provides a framework for developing service-oriented applications, neither specifically focuses on the integration function that defines ESB. A Data Exchange System (DES) might imply data sharing but does not encapsulate the broader integration capabilities provided by an ESB. Thus, ESB clearly stands out as the correct term for integrating various services in a coherent manner.