DevOps has emerged as a transformative approach in modern software development, emphasizing collaboration, automation, and continuous delivery to improve the speed and quality of application deployment. Automation tools play a crucial role in enabling DevOps practices by streamlining processes such as code integration, testing, deployment, and infrastructure management. This review provides a comprehensive analysis of widely used DevOps automation tools and practices, including continuous integration and continuous deployment pipelines, configuration management, containerization, and orchestration. Tools such as Jenkins, GitHub Actions, Docker, Kubernetes, Ansible, and Terraform are examined in terms of their functionality and impact on development workflows. The study also explores key DevOps practices such as infrastructure as code, automated testing, monitoring, and feedback loops that enhance system reliability and efficiency. Challenges such as tool integration, security concerns, and cultural adoption are discussed along with potential solutions. The findings highlight that effective use of DevOps automation tools significantly improves development agility, reduces deployment time, and enhances overall system performance.