<input type="radio"/>

Question

is that necessary to ad the name and value to the input type="radio" element??
if that necessary please tel me what i can add to the value ? any text? any number?? or specific something else?
and what i can add to the name? is that something specific or any text i want?
and why (for what) i have to use them?
in another words why we use the value and name in the element <input type="radio">?

Answer 1

For text and numeric or specific
<input type="text" value="for everything" >

Answer 2

Is it necessary to close the 'input' adding a slash. Is the example <input type="checkbox"> incorrect?