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We review the basic idea behind resource theories, where we quantify quantumresources by specifying a restricted class of operations. This divides thestate space into various sets, including states which are free (because theycan be created under the class of operations), and those which are a resource(because they cannot be). One can quantify the worth of the resource by therelative entropy distance to the set of free states, and under certainconditions, this is a unique measure which quantifies the rate of state tostate transitions. The framework includes entanglement, asymmetry and puritytheory. It also includes thermodynamics, which is a hybrid resource theorycombining purity theory and asymmetry. Another hybrid resource theory whichmerges purity theory and entanglement can be used to study quantumness ofcorrelations and discord, and we present quantumness in this more generalframework of resource theories.

(Quantumness in the context of) Resource Theories