Question

What is the difference between tautomerization and resonance?

Answer 1

Mainly, resonance doesn't require protonation or deprotonation, but tautomerization does.

You can see the mechanism for keto-enol tautomerization here.
http://socratic.org/questions/how-can-we-work-out-tautomeric-isomers-step-wise-as-per-required-conditions-1

To learn more about resonance, you can look here:
http://socratic.org/questions/what-are-major-resonance-structures