Pro vs. Non-pro.

Ano ba pinagkaiba nila? Kailan ba kailangang ang professional driver's license?
Pwede mo ba ipa-iba restriction mo to drive a truck/bus and still stay non-pro?

Aside from police clearance/medical/drug test, ano pa ba ang kailangan mong dalhin kapag magpapalit from non-pro to pro?

Thank you.