what is the filename.js?m=1497883755 in script attachment src?

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I am facing a issue to rectify a jQuery file.

It's integration code is like this below.

<script type="text/javascript" src="js/global.footc75d.js?m=1497883755"></script>

my question is what is the ".js?m=1497883755" in this? what is the use of this..? why it was used this way not normally..?

and this one is looking like this below in the chrome browser > Developer tool > Network tab.

enter image description here

Requested to share the full detail about it. Why this was used this way..? not just by file name only..? should I use the same way in the future if yes then which condition..?? and how to edit the code in this condition.. how do I find and remove the code which is loading loader_light.gif here..?

Thanks to all in anticipate..

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