Today, mainframe computers play a central role in the daily operations of most of the world's largest corporations. ... In banking, finance, health care, insurance, utilities, government, and a multitude of other public and private enterprises, the mainframe computer continues to be the foundation of modern business.

Is mainframe going away?

With the advent of new technologies such as the cloud and low-cost x86 commodity servers, many tech pundits expected the mainframe to fade away sooner rather than later. But that's far from the case. In fact, in 2021 the venerable mainframe is still as relevant as ever for many enterprises around the world.

What companies still use mainframe?