Kufr, in Islamic terminology, refers to the act of disbelief or rejection of the fundamental tenets of Islam. It is often associated with denying the existence of Allah or the prophethood of Muhammad. Kufr can manifest in various forms, including outright denial, ingratitude, or associating partners with Allah. In Islamic theology, kufr is considered a serious offense, as it undermines the core beliefs of the faith. Those who commit kufr are often categorized into different types, such as kufr al-juhud (denial) and kufr al-nifaq (hypocrisy), each with distinct implications for one's faith and actions.