Why do my iphone google searches show up on my home computers?

I have no used my hp laptop in almost an entire year, since I got my mac, which i got the day i got my iphone. However this summer when i returned home from school, my mac charger was buried under all my other stuff and i decided to break out my old hp laptop. I noticed that all my iphone searches (that i use google for and safari) show up on my hp laptop. I'm curious as to how this is even possible knowing that i go to school in a different and am using a different internet connection when i'm on my iphone. Not that i search anything inappropriate whatsoever, but these searches do appear on my moms laptop as well, and i was curious as to how this is happening. She does not own a mac either.
Anyone know how/why this is happening, and how to keep my searches private/separate that are on my phone versus my laptop.

You are using your google account when you are searching things. IPhone requires you to use a gmail for activating. Just like how when you clear your search history on your phone, it clears it on your computer ad well. Maybe log off your account or just clear your searches or go to settings under google.