Cisco Switches, TwinGig converter modules and SFP

I am a newbie to Cisco switches. Can anyone explain to me what TwinGig Converter Modules and SFP are used for Cisco Switches?

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from_expConnect With a Mentor Commented:
basically, you have plug-able modules like SFP (1Gig) or X2 (10Gig), they are mainly used, when you need to connect fiber lines to a switch.

So for some models cisco offers twingig converters, when you have switch with 10G option port, but don't need 10G at the moment. so you can populate that 10G option with twin gig converter, add SFPs and get 2Gigs instead of 10.
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