Because op searched for it. Searching for something is recorded on your computer and google, if that was used. Then when google shows ads for stuff it looks at what you searched for in the past and pops those ads up. Google gets more money for ads that are clicked on so it's in their best interest to pop up ads you may be interested in. People! Heed me! Install an f'ing ad blocker. Ublock origin is my top choice. Adblock plus is my next choice. Adblock plus may in the future, if not already, take money from advertisers and let those through. Not only are ads annoying af but they can bring viruses to your puter.