It helps in applying settings to muliple syntaxes and applying syntax to given extensions.
I don't understand why ST makes it so difficult to toogle the same setting across several different syntaxes. For example, if someone wants to enable auto_match_enabled for python and c. He has to create two files Packages/User/Python.sublime-settings and Packages/User/C.sublime-settings. Then add, in each of the files,
This plugin makes it easier by the considering following setting
"scopes": "source.c", "source.python"],
"auto_match_enabled" : true