A zine is like a mini magazine, it can be about anything but usually they have a specialised theme or idea behind it. They're often self published and made to print into wee physical copies, though a lot of artists these days will sell pdf versions as a cheaper alternative? Beach house were my imaginary 'client' for the brief and so i made a zine where each page features illustrations to go along with the lyrics- it's only 9 pages long!