What does it mean if part of an Iphone touch screen is unresponsive?

Only the right side of my Iphone isn't responding. I can only get passed the lockcode which is a struggle. (7-6-7-3)
6 and 3 are really hard to press. There's no pixelated or white lines running down it, it looks perfectly normal. So can someone tell me what it is?

It means that underneath the screen, the cables/wires that connect the touch screen aren't working properly and it's not sending the signal.

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