A Site Reliability Engineer (SRE) is a professional who ensures that a company's online services run smoothly and efficiently. They combine software engineering skills with IT operations to create reliable systems. By monitoring performance and fixing issues, SREs help maintain high availability and quick response times for users. SREs often work closely with development teams to implement best practices in coding and deployment. They use tools like monitoring software and automation scripts to streamline processes. Their goal is to improve system reliability while also enabling faster feature releases, ultimately enhancing the user experience.