  We review different notions of cuts appearing throughout the literature on
scattering amplitudes. Despite similar names, such as unitarity cuts or
generalized cuts, they often represent distinct computations and distinct
physics. We consolidate this knowledge, summarize how cuts are used in various
computational strategies, and explain their relations to other quantities
including imaginary parts, discontinuities, and monodromies. Differences and
nuances are illustrated on explicit examples.
