Mainframe is a class of computers that controls many connected uses and has a high volume of transactions hence providing more reliable performance. Client-server and mainframe network promotes great

Mainframe is a class of computers that controls many connected uses and has a high volume of transactions hence providing more reliable performance. Client-server and mainframe network promotes great security of the computer network and has more control and hence can see what every computer is doing
Given these comments regarding mainframes–why use mainframes? What are they used for today?
Please give more pacific answer for this question.
Paper can be 1 to 2 pages long
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