Mainframe DevOps is the practice of applying DevOps principles and practices to mainframe environments. It involves automating, integrating, and streamlining the software development and delivery processes on mainframes. Key aspects include version control, continuous integration, automated testing, and deployment automation for mainframe applications. Mainframe DevOps aims to accelerate software delivery, improve collaboration between mainframe and distributed teams, and ensure the reliability and scalability of mainframe applications in a modern software development ecosystem. It combines traditional mainframe development practices with modern DevOps techniques to enhance agility and efficiency in mainframe software development.