Random Casino Link has Appeared on my wordpress site

Hi, Im new to WordPress but I have managed to get my site up and running without many problems, however… Yesterday and totally out the blue a link has appeared at the bottom of my page:- https://——games.com/online-bingo/

I have nothing to do with Onlinecasino-games, I’m not getting paid to host their link so how has this appeared and more importantly how do I remove this?

Many thanks.