What is the correct concept of an Islamic state, what are its characteristics and specifications, and are all states belonging to the Organization of Islamic Cooperation, with Malaysia at their forefront, considered Islamic states in the Sharia sense?

The jurists defined Dar al-Islam (the abode of Islam) as the land where the rulings of Islam are enforced and where power and dominance belong to Muslims. Any country that fits this description is an Islamic state, and any country that does not is not an Islamic state.