The passanger name record which is popularly known as PNR in india is the database of a computer reservation system(CRS) that contains the information for the railway passangers in India .
When a passanger books the ticket from railway counter or via agent or through web sites of IRCTC the PNR number automatically generated by the reservation system.
The PNR status can be checked through the railway database which available through the web site and SMS as well.
To check your PNR status you can click the following link.
Click on PNR to get the status
Click the link to see the PNR status