Continuous integration (CI) has become an essential practice for agile software development teams, enhancing the speed and quality of software deployment by automatically integrating and testing code changes. Originating from Extreme Programming in 1997, CI tools have evolved to support both open-source and commercial environments, whether locally or cloud-hosted. Popular CI tools include Jenkins, a Java-based open-source option with extensive plugin support, and TeamCity, known for its project hierarchy features and flexibility in development on .NET or mobile platforms. Travis CI and CircleCI cater specifically to GitHub users, offering straightforward integration and testing for various programming languages, while Codeship and CruiseControl provide additional options with unique features and pricing models. Each tool presents different strengths, such as ease of use, customization, and integration capabilities, allowing teams to choose solutions based on their specific development environments, budgets, and infrastructure preferences. By employing CI, teams can achieve greater productivity and streamlined workflows, adapting swiftly to the competitive demands of software development.