Continuous Integration and Continuous Delivery (CI/CD) are crucial elements of modern software development, and selecting the right CI/CD tool is essential for optimizing development workflows. This comparative analysis examines four popular CI/CD tools: Jenkins, Travis CI, Bamboo, and TeamCity, highlighting their unique features, strengths, and limitations. Jenkins, an open-source tool, is known for its extensive plugin ecosystem and global support, while Travis CI offers a user-friendly interface with a focus on integration with GitHub and faster build processes. Bamboo, developed by Atlassian, integrates seamlessly with Jira and Bitbucket, providing robust visibility and management capabilities, whereas TeamCity, a commercial tool by JetBrains, emphasizes quality testing and offers strong support for Java and .NET projects. Key considerations for choosing a CI/CD tool include hosting options, user interface, integration capabilities, and support for reusable code libraries and container orchestration, with the decision largely depending on an organization's internal resources, budget, and specific requirements.