I’m being silly, but have a serious question.

I just got a fifteen G fender amp for my guitar and only play from home and noticed there was a headphone option. That suits me a lot as sometimes my parents work from home so need a quiet way to practice. However why is the plus so big for it compared to a normal headphone jack? The yellow and red ones next to it are around a headphone size not the big one? I’m so confused, is there a special adapter or type of headphones needed? Thankyou!