Here we define the radio button using "input" tag.
We give a attribute called "TYPE=RADIO" in the tag which defines the type as a radio button.
The attribute name should be defined and be same. The value in this case will be used only during form processing.
Note: All the input of this type should have the same name. This name is what groups them.
If you have different names for each radio button then they will behave individually.