Q: my mac air keeps getting popped up websites and videos, what is happening? i thought macs don't get viruses i just got this laptop too

ok so i think there is a virus on my laptop bc it has been getting A LOT of pop up websites and videos ads. I just got the laptop literally a week ago and this never happen till today. I believe i downloaded the virus by accident thinking it was a java update bc since then my laptop hasn't been the same. Also, i would like to mention that "java video update" popped up while my cousin was trying to watch a movie on put locker. is there a virus? the websites always relate to mac products like for instance when i clicked on the question to type a new safari page popped up called "macmail" and they are mostly "clean your mac" websites. I trashed the downloads and then emptied my trash but I'm still getting the pop ups.