DevOps is a collaborative approach that aims to merge software development and IT operations. It focuses on breaking down silos between these teams to enable continuous integration, continuous delivery, and faster, more reliable software deployment.

Site Reliability Engineering (SRE) is a specific implementation of DevOps principles. It emphasizes using software engineering practices to maintain and operate large-scale, reliable systems. SREs focus on automating tasks, monitoring system health, and ensuring service reliability.

In simple terms, DevOps is a broader philosophy that promotes collaboration between development and operations, while SRE is a specialized role within DevOps that focuses on maintaining and improving system reliability using software engineering techniques.