How to understand the output of time command?

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I am trying to figure out the performance of my code, but I do not understand the output of the time command, Can anybody please explain what does time command output means.

The following is what I get:

time ./filereader 

real    0m0.193s
user    0m0.012s
sys 0m0.056s

What is real, user, sys?

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