Site Reliability Engineering (SRE) and DevSecOps both improve modern software systems, but they focus on different goals. SRE is mainly about ensuring reliability, availability, and performance through monitoring, automation, incident management, and service-level objectives (SLOs). DevSecOps focuses on embedding security into every stage of development and deployment, using practices like automated security testing and vulnerability management. They overlap in areas like CI/CD, automation, and observability, and when combined, they help organizations build systems that are both highly reliable and secure, ensuring smooth, safe, and efficient software delivery.