What is I/O of linux server?


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My site hosted in a shared hosting on a linux server. From cpanel's resouce usage option, I can see that I/O limit for my site is 4096 and in peak time, my site often reaches to its I/O limit. As I don't know much about it and as I didn't find any details article about it after googling, I was unable to optimize my php scripts to reduce the I/O. The only thing I know about it, is Input-Output Process. Would someone explain it what is I/O and how can I reduce I/O?
Thanks in Advance.

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