which links all the atm's in india
National Financial Switch National Financial Switch (NFS) is the largest network of shared automated teller machines (ATMs) in India.[1] It was designed, developed and deployed by the Institute for Development and Research in Banking Technology (IDRBT) in 2004, with the goal of inter-connecting the ATMs in the country and facilitating convenience banking. It is run by the National Payments Corporation of India (NPCI).
ATM card The size of ATM cards is 85.60 mm × 53.98 mm (3.370 in × 2.125 in) and rounded corners with a radius of 2.88–3.48 mm, in accordance with ISO/IEC 7810#ID-1, the same size as other payment cards, such as credit, debit and other cards. They also have a printed or embossed bank card number conforming with the ISO/IEC 7812 numbering standard.