Fiber Distributed Data interface is the standard for fiber optic networks. Asynchronous Transfer Mode is for broadband applications in public networks. FDDI with 100 Mbits to several GBs. ATM with 100 to 622 Mbits. ATM works for 40 Kms and FDDI works better for 200 Kms.
Well FDDI stands for Fiber distributed data interface it means it has the capability to transfer data in a local area networking but it is able to transfer it up to 200 kilometers. In addition to covering large geographical areas it also provides information to thousands of users at a time. It is a token ring network but it does not use IEEE 802.5 token ring protocol as its basis instead it is derived from IEEE 802.4 token bus timed token protocol. On the other hand ATM Machines are Automated teller machine they use electronic bank transfer or EFT and mostly use a wide area networking. Most ATMs are connected to interbank networks, enabling people to withdraw and deposit money from machines not belonging to the bank where they have their account or in the country where their accounts are held