Apache ZooKeeper

Apache Zookeeper is an open-source tool used to manage and coordinate distributed systems efficiently. Think of it as a central directory or a traffic controller for multiple servers, ensuring they work together smoothly. It helps track configurations, provides naming services, and handles synchronization, so that different parts of an application can share information and stay updated. This is particularly useful in environments where multiple machines need to collaborate, like cloud computing or big data platforms, enabling more reliable and scalable applications.