Mainframe computing refers to the use of powerful computers, known as mainframes, that are designed to handle large volumes of data and support numerous users simultaneously. These systems are commonly used by large organizations for critical applications, such as transaction processing, data management, and enterprise resource planning. Mainframes are known for their reliability, security, and ability to run multiple operating systems at once. Mainframes typically operate in a centralized environment, allowing for efficient resource management and data sharing. They are often used in industries like finance, healthcare, and government, where processing speed and data integrity are essential. The architecture of mainframe systems enables them to perform complex calculations and manage vast databases effectively.