Hi! "oir" = "hear", "escuchar" = "listen" (http://www.englishteachermelanie.com/vocabulary-listen-or-hear/) ¡Saludos!

Hi Ahmed :) Oir: it is to listen something. Escuchar: it is to pay attention what you are listening to. However, a lot of natives don't know it. But, it is the real difference. Saludos.