SEZs are same as Industrial townships in a sense.

No,sez are known special economic zones-A Special Economic Zone (SEZ) is a geographical region that has economic laws that are more liberal than a country's typical economy.Usually the goal of an SEZ structure is to increase foreign investment. The policy provides for setting up of SEZs in the public, private, joint sector or by State Governments. It was also envisaged that some of the existing Export Processing Zones would be converted into Special Economic Zones. Accordingly, the Government has converted Export Processing zones located at

* Visakhapatnam (Andhra Pradesh)
* Ahmedabad, Baroda, Kandla and Surat (Gujarat)
* Cochin (Kerala)
* Pithampur (Madhya Pradesh)
* Nagpur also refer MIHAN, Pune and Santa Cruz-Mumbai (Maharashtra)
* Chennai, Ilandaikulam Madurai, Nanguneri and Tirunelveli (Tamil Nadu)
* NOIDA, Greater NOIDA (Uttar Pradesh) UP
* Falta (West Bengal)