How to apply for PAN card in INDIA?

I want a pan card to apply for a job in a private company as PAN CARD is the necessity to apply for their jobs. Presently I am not earning anything, Can I apply? If yes do they charge me tax without any earning.Please tell me the whole concept of pan card. Also tell me what documents will be required to apply for a pan card.

Thank you in advance for ur valuable time and info.