What is the Cisco MIB File and How is it Used?

I have 20 Cisco Small Buisness 300 Series managed Switches That Need the firmware upgraded and I found the link to the firmware pack http://www.cisco.com/cisco/software/type.html?mdfid=283019611&flowid=18901

Buit it also has a MIB file. What is the MIB and how is it used? Do I need to update it along with the firmware? Do I do it before or after a firmware update or does it matter.

Sorry if this is a simple question but my cisco experience is very little and I have not found a clear answer to this just doing internet searches.
Who is Participating?
The mib file is used for SNMP Monitoring tools.
If you dont use SNMP in your network you can ignore this file
A MIB is a reference for SNMP OIDs and traps. Basically it translates the data from SNMP (Simple Network Management Protocol) queries into human readable useful information.

Please see the following for a detailed explanation http://www.paessler.com/knowledgebase/en/topic/653-how-do-snmp-mibs-and-oids-work
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