The mind is the set of faculties responsible for all mental phenomena. Often the term is also identified with the phenomena themselves. These faculties include thought, imagination, memory, will, and sensation. They are responsible for various mental phenomena, like perception, pain experience, belief, desire, intention, and emotion. Various overlapping classifications of mental phenomena have been proposed. Important distinctions group them according to whether they are sensory, propositional, intentional, conscious, or occurrent. Minds were traditionally understood as substances but it is more common in the contemporary perspective to conceive them as properties or capacities possessed by humans and higher animals. Various competing definitions of the exact nature of the mind or mentality have been proposed. Epistemic definitions focus on the privileged epistemic access the subject has to these states. Consciousness-based approaches give primacy to the conscious mind and allow unconscious mental phenomena as part of the mind only to the extent that they stand in the right relation to the conscious mind. According to intentionality-based approaches, the power to refer to objects and to represent the world is the mark of the mental. For behaviorism, whether an entity has a mind only depends on how it behaves in response to external stimuli while functionalism defines mental states in terms of the causal roles they play. Central questions for the study of mind, like whether other entities besides humans have minds or how the relation between body and mind is to be conceived, are strongly influenced by the choice of one's definition.

मन मस्तिष्क की उस क्षमता को कहते हैं जो मनुष्य को चिंतन शक्ति, स्मरण-शक्ति, निर्णय शक्ति, बुद्धि, भाव, इंद्रियाग्राह्यता, एकाग्रता, व्यवहार, परिज्ञान (अंतर्दृष्टि), इत्यादि में सक्षम बनाती है। सामान्य भाषा में मन शरीर का वह हिस्सा या प्रक्रिया है जो किसी ज्ञातव्य को ग्रहण करने, सोचने और समझने का कार्य करता है। यह मस्तिष्क का एक प्रकार्य है।