What is a metallic bond

And how does it make metals better conductors? Is it because the free electrons move charges around better than things with electrons bound to the nucleus better?
 
Basically, it's the sharing of electrons in a lattice of metallic cations.

This type of bonding makes metals better conductors because these free electrons are mobile (not attached to a particular ion). If electrons from an outside source enter a metal free electrons will be able to move along the metal.
 

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