how do the internet ads know where i am

i just saw an internet ads advertising luxury apartments opening soon in my town and this is an american software that i use, so how does it know where i am to advertise in the town i am in??

also how can i stop them knowing about my location?

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OlderSometimesWiser · F

IP address?

durinsBane1983 · 46-50, M

@OlderSometimesWiser lol thanks i dont know.