why jailbreak my ipod touch?

Dragnorock

New member
i just got an ipod touch and my friends tell me i should jailbreak it but none of them could exactly tell me all the reasons i should jailbreak...
so i want to know why do people jailbreak their devices?
and are there any side effects? like slowing of the device or crashing?
could i "unjailbreak" it after its jailbroken?
 
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