Site Reliability Engineering (SRE) is a discipline that applies software engineering principles to operations in order to create reliable and scalable software systems, with a focus on improving system reliability in areas such as availability, performance, and incident response. Coined by Google in 2003, SRE aims to automate and optimize operations, bridging the gap between development and operations teams to ensure seamless and reliable software deployment. The key benefits of implementing SRE practices include increased system reliability, improved scalability and user experience, cost savings through automation, and enhanced collaboration across teams. SREs are responsible for tasks such as monitoring infrastructure, responding to incidents, automating processes, and planning for capacity, often acting as first-line defenders during system alerts. The approach requires cultural changes within organizations, emphasizing a collaborative environment that integrates DevOps practices and fosters continuous learning. SRE and DevOps are complementary, with DevOps focusing on speeding up changes and SRE ensuring these changes are reliable. Ultimately, SRE is an evolving field that continually adapts to the demands of digital infrastructure, requiring openness and a willingness to learn from both successes and failures.