A PAN (Permanent Account Number) card is a unique 10-character alphanumeric identifier issued by the Income Tax Department of India to individuals and entities for tax purposes.

In terms of functionality, there is no difference between a new PAN card and an old one. Both contain the same information, such as the PAN number, name, date of birth, and photograph of the cardholder.

However, there have been changes in the format of PAN cards over the years. Old PAN cards were issued in a laminated paper format, while newer ones are issued as plastic cards. The new PAN cards also have additional security features such as a hologram and embossed signature.

In addition, the newer PAN cards may have QR codes that can be used to verify the authenticity of the card. It is important to note that if an individual already has a PAN card, they do not need to apply for a new one unless the card has been lost, stolen, or damaged