ActiveMQ is an open source messaging technology that allows for communication between different applications and services. It's a popular choice for enterprise integration due to its scalability, performance, and flexibility. ActiveMQ is highly extensible, allowing developers to customize the technology to their specific needs. It also provides an intuitive management interface that makes it easy to manage and monitor operations. With its robust security features, ActiveMQ is ideal for mission-critical applications. For developers looking for a reliable messaging solution, ActiveMQ is an excellent choice.