To unravel me You need a simple key No key that was made By locksmiths hand But a key that only I Will understand What am I?

A code.

There are a couple of ways to get a key made without a key, or when one is lost. For a vehicle one can be made from a code which when decoded gives the cuts of the physical key. Another way is by...

A key?

I've got a better question, why is this question in the Chevy venture forum ?

keys r made up of.........something!