How can we distinguish between different types of PCB?

[chandans]

they have different names or something else?

 

[Svein]

Do you mean Printed Circuit Boards? If so, they have different isolating materials, different number of layers, different processing requirements etc. etc.

 

[jim hardy]

A question well stated is half answered.

Differentiate? meaning
"Distinguish" , or "Take derivative of" , or "Chemically separate" ??
pcb from http://acronyms.thefreedictionary.com/PCB

Acronym Definition
PCB Printed Circuit Board
PCB Polychlorinated Biphenyls (CAS Number 27323-18-8)
PCB Pakistan Cricket Board
PCB Panama City Beach (Florida)
PCB Partido Comunista Brasileiro (Brazilian Communist Party)

Perhaps you'll clarify what you meant.