Mainframe computing utilizes a variety of programming languages, each serving different purposes and functionalities. Some of the most commonly used languages include COBOL, which is primarily used for business applications; PL/I, known for its versatility in both business and scientific applications; and Assembler, which is used for low-level programming. Additionally, languages like Java and C are also employed, especially for modern applications that require integration with other systems. Other languages such as REXX and SQL are used for scripting and database management, respectively. In summary, mainframe computing relies on a diverse set of programming languages tailored to meet various needs. COBOL stands out for business applications, while PL/I offers versatility across different domains. Assembler is favored for low-level tasks, and modern languages like Java and C are increasingly integrated into mainframe environments. Furthermore, REXX and SQL play important roles in scripting and database management, showcasing the breadth of programming languages utilized in this field.