Since Spanish is spoken in many countries all around the world, there are three (at least three) words which are translated as Computer
Ordenador is from Spain Computador is used in Chile and Columbia
But the other spanish speaking countries prefer saying computadora. This one seems to be the most beautiful ^_^
I know and I prefer this one because it doesn't sound like "com puta Dora". OMG I said it... I'm so sorry, I never use swer words or slangs and I'm shy to say that. And I'm so sorry if there is someone named Dora here. Please forgive me.
But this course in Duolingo teaches us the Latin American Spanish. If you want to learn the original Spanish of Spain, try with https://www.memrise.com and choose "Spanish of Spain".