What is IBM Assembler?

IBM Assembler refers to a family of low-level programming languages used primarily on IBM mainframe systems, such as z/OS. It provides direct control over the hardware and memory, enabling highly optimized code for performance-critical applications like operating systems, transaction processing systems (e.g., CICS), and database management systems (e.g., DB2). While complex to use compared to higher-level languages, Assembler allows programmers to leverage specific hardware features and achieve maximum efficiency.