what mainframe computer is and how it works
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Lets say in your job there are occasionally really hard math problems that need to be solved. So the company has someone really good at math sit by your desk and solve the problems when they come up. But people who can solve really hard math problems are hard to find and get paid a lot. Since the problems only come up occasionally, the math person isn’t doing much most of the time.
So your company decides that instead of having a math person at every desk, they will set up a room full of math people. Instead of having your problems solved at your desk, you will send them to the math room where they will be assigned to someone to solve. Since multiple people can use the same person they need less math people and the ones they have will be working most of the time. Plus, when you have a really really hard problem multiple people can work on it together.
That is basically what a mainframe is. A computer designed to handle a large amount of operations as quickly as possible for things like data and transaction processing.
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