1. Scalability: One key difference between Jenkins and Zookeeper is their scalability. Jenkins is more suited for Continuous Integration (CI) and Continuous Deployment (CD) in smaller to medium-sized organizations due to its focus on build automation. On the other hand, Zookeeper is designed for high availability and scalability in distributed systems, making it more suitable for large-scale applications that require coordination and synchronization across multiple nodes.

2. Purpose: Jenkins primarily focuses on automating the building, testing, and deployment of software, making it an ideal tool for DevOps workflows. In contrast, Zookeeper is used for maintaining configuration information, naming, providing distributed synchronization, and group services in a distributed environment. Each tool serves a specific purpose in software development and system management.

3. Architecture: Jenkins follows a master-slave architecture where the Jenkins master handles all tasks related to job scheduling and distributes builds to multiple Jenkins slave nodes for execution. Zookeeper, on the other hand, uses a coordinated service architecture where multiple nodes work together to form a single distributed system that provides high availability and reliability for applications.

4. Consistency Model: Jenkins does not enforce a strict consistency model and relies on individual build jobs for consistency within the CI/CD pipeline. In contrast, Zookeeper follows a strong consistency model, ensuring that data is consistent across all nodes in the distributed system at any given time, making it suitable for critical applications that require strong guarantees on data consistency.

5. Monitoring and Management: Jenkins provides a user-friendly web interface for monitoring and managing CI/CD pipelines, making it easy for developers and DevOps teams to track build statuses and manage workflows. Zookeeper, on the other hand, offers a command-line interface and APIs for monitoring and managing the distributed system, catering to system administrators and developers working with distributed applications.

6. Community Support: Jenkins has a vast community of users and contributors, leading to a wide range of plugins and integrations that extend its functionality and support various tools and technologies. Zookeeper, while also having community support, is more focused on providing robust distributed coordination services, with fewer plugins and integrations compared to Jenkins.

In Summary, Jenkins is more suitable for CI/CD workflows in smaller to medium-sized organizations, while Zookeeper is designed for high availability and scalability in distributed systems, offering features like strong consistency, distributed coordination, and reliable data management.