Continuous integration (CI) and continuous deployment (CD) are crucial components of modern software development, facilitating faster and more frequent delivery of features to end users by automating the coding and deployment processes. CI focuses on integrating code changes frequently and efficiently, minimizing risks by utilizing automation, such as code quality gates and tests, to provide immediate feedback to developers. This process establishes a robust foundation for CD, which further automates the deployment of code into production environments, ensuring rapid feature delivery and allowing teams to quickly validate updates with users. While CI emphasizes the feedback loop for engineering teams, CD prioritizes the feedback loop for product teams, both playing essential roles in maintaining high delivery velocity. The guide highlights the importance of a collaborative culture, security, and observability in successfully implementing CI/CD, with tools like Earthly offering solutions to streamline these processes.