Zuul is a gateway service that provides dynamic routing, monitoring, resiliency, security, and more. It is developed by Netflix and integrated with Spring Cloud. Zuul can be used to proxy calls from a front-end application to one or more back-end services. Some possible description words for Zuul are:

• Powerful: Zuul can handle a large amount of traffic and provide various features for load balancing, fault tolerance, and security.
• Flexible: Zuul can be configured to route requests based on different criteria, such as path, header, or parameter. Zuul can also apply filters to modify requests and responses.
• Extensible: Zuul can be customized to add new functionality or integrate with other services. Zuul supports both Java and Groovy for writing filters.