ELI5: mainframe

// eli5

What is a mainframe computer?

A mainframe is a really big, powerful computer that can do tons of work at the same time, kind of like how a big factory can make lots of products while a small workshop makes just a few [1]. It's not the biggest computer (supercomputers are bigger), but it's way more powerful than a regular computer [1].

Why do we use them?

Mainframes are used by big companies and banks because they can handle millions of transactions at once without getting tired or slow [1]. They're like the workhorse of the computing world—they just keep working, day after day, without stopping [3].

How are they changing?

Today, mainframes are learning to work with newer technology called cloud computing, which is like moving some of their power to the internet [3]. People are also putting Linux (a free operating system) on mainframes so they can use free software alongside their regular programs [4].

Why should I care?

Even though you don't see mainframes, they're probably processing your bank transactions or running the systems that book your airplane tickets right now [1][3].