Jahl means "Ignorance" or the lack of knowledge. In Islam, Jahl is classified into two types: "Jahl Basit" (simple ignorance), where one knows they don’t know, and "Jahl Murakkab" (complex ignorance), where one is ignorant but believes they are knowledgeable. Islam strongly opposes Jahl by making the seeking of knowledge an obligation for every Muslim. Ignorance is seen as the root of all evil, superstition, and social injustice, while "Ilm" (knowledge) is the key to spiritual liberation and the advancement of civilization according to Divine purpose.