Sorry Mayur, it's not often I do this, but please re-learn your oxygen sensor stuff from somewhere, because you are spreading a LOT of misleading information.
Firstly there are two basic materials used in oxygen sensors, Zirconia, by far and away most common, and Titania, as used on some Range Rover/Discos (and some others, but this is keeping it relevant to us.), therse are pretty rare
So now we have the materials, we need to talk about the number of wires....
Firstly Narrowband Zirconia sensors:
1 wire, 0-1v, the most basic version.
2 wire, 0-1v, one wire is signal, one is ground
3 wire, 0-1v, one wire (black) signal, one is supplied 12v for the heater, and a shared ground
4 wire, 0-1v, one wire (black) signal, one signal ground (grey), two white wires, one ground and one 12V for the heater.
The output signal is rapid switching between 0 and 1v.
Now, Narrowband Titania sensors:
These give an output of 0-5v, switching from 1000 Ohms to 20,000 Ohms quickly. I'm unsure of the number of wires as they are relatively rare, and of no use to me. But I suspect they are heated and require 4 wires, connected the same way as the 4-Zirconia senssors.
Wideband sensors:
This is a whole different kettle of fish. They no longer switch between 0-1v or 0-5v but deliver a linear voltage between two set limits (0 and 5v or 0 and 12v for example) giving much greater precision for tuning purposes. Wideband sensors generally use zirconia as the sensing element, however there is a lot more to it than just the element in this case.
These have 6 wires:
2 for heater
1 resistor
1 ground
1 pump
1 sensor
I hope this clarifies things a little for you and others, if not, have a read here:
http://en.wikipedia.org/wiki/Oxygen_sensor
and
http://www.picoauto.com/applications/lambda-sensor.html
and if you want more, Google will reveal all.