Another common example consists of Unix pseudoterminals(pty) which present a standard tty interface to user applications, including virtual serial controls.
That's a common example, but Linux containers can be applied to problems in many different ways where ultimate portability, configurability, and isolation is needed.
A common example of this is having children attempt to fit saucepan lids to saucepans of different sizes, or fitting together different sizes of nuts and bolts.
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