DevOps aims to improve software development through collaboration between development and operations teams. This allows for more frequent and reliable deployments through automation and continuous integration. Key DevOps tools include version control systems, continuous integration servers, automation tools, and testing frameworks. Cloud services are well-suited for DevOps as they allow for flexible infrastructure provisioning and reduce time spent managing hardware. Common cloud service models are PaaS, SaaS, and IaaS, which provide platforms, software, and infrastructure respectively on a pay-per-use basis. While tools and cloud can help, people remain the most important factor in DevOps success.