Customised advertising from when we speak

I found, and I knew a few others have also experiences this, that at times I may say something and the next thing I know, I will have an advert pop up on my phone for this thing. I know this could be complete coincidence, however I had never received these sorts of adverts before.

In this case I had an advert for Tinder, I had never downloaded of even thought about tinder before, however I was speaking about it to my sister as she uses it for amusement and then all of a sudden, I checked my phone and went through Tik Tok and I had an advert for it, I thought this to be really odd.

I have heard of people having similar experiences with this sort of scenario and I just think it’s really odd. Are they listening to us? Why? How would they know to advertise these things otherwise?