snmp version

"snmp girl" <[email protected]>
Newsgroups gmane.network.net-snmp.user
Message-ID <[email protected]>
HELLO?

I am being confused , when should i use v1 or v 2c or even v3?
I can't distingue the difference between using those version in my snmp
queries or either in sending traps?
what can be changed if I send a trap with using v1 instead of v 2c ?
thank you for answering me as soon as possible and sorry for this question
but really I feel lost with those version

thanks

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