What is the difference between Catholic church and non denominational churches?

What is the difference between Catholic church and non denominational churches? Shabir Ally has earned a B.A. in Religious Studies from Laurentian University in Sudbury, Ontario, with a specialization in Biblical Literature, and an M.A. in Religious Studies from the University of Toronto with a specialization in Quranic Exegesis. He is now in his fourth year of Ph.D studies in Quranic Exegesis at the University of Toronto. He is the president of the Islamic Information & Dawah Centre International in Toronto where he functions as Imam. He travels internationally to represent Islam in public lectures and interfaith dialogues. He explains Islam on a weekly television program called "Let the Quran