UbuIslam yinkolo eyathunyelwa kubantu ngomprofethi wokugcina kaNkulunkulu, uMphrofethi uMuhammad (ukuthula kube kuye), efundisa ngokuphila ngokuqonda ukuthi uNkulunkulu munye (Tawhid) nendlela yokuphila elungile. Kulesi sigaba, kuxoxwa ngezimiso eziyisisekelo zokholo lobuIslam, izenzo zokukhonza, izindinganiso zokuziphatha, kanye nezimiso ezilawula impilo yomuntu ngobuIslam. UbuIslam bubizela abantu ukuba bakhonze uNkulunkulu kuphela futhi bazame ukuthola ukwamukeleka kuYena. Izinsika ezinhlanu zobuIslam (shahada, umkhuleko, ukuzila ukudla, izakat, kanye neHajj) ziyizinto eziyisisekelo zalesi sigaba. Ngaphezu kwalokho, ulwazi mayelana nezindinganiso zomhlaba wonke ezinjengomthetho, ubulungiswa, inkululeko, ukulingana, kanye nokubekezelelana ebuIslam, kanye nesiqondiso ubuIslam obusinikeza abantu nomphakathi, kanye nentuthuko yomuntu siqu ngokomoya, lunikezwa. UbuIslam yimfundiso ebanzi ehlanganisa impilo yomuntu siqu neyomphakathi, futhi ihlose ukuba uthando nokuzinikela kuNkulunkulu kubonakale ngaso sonke isikhathi empilweni.