My iphone screen doesn't respond to my touch?

I have an iphone 4s and the screen lights up and works but there are tons of dead spots that won't respond to my touch i need to know what part i have to order to fix this do i just need the glass or do i need the touch screen and digitizer or what please help! And if you had the same problem and fixed it please put a link in your comment to a video that will show me how to repair it please help! As soon as possible thank you

Did you try turning it off and on again?

Reset or restore your iPhone for a try, this can fix many general iPhone problems.

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