A dwarf galaxy has relatively low stellar mass and luminosity and is often strongly dark-matter dominated. Its shallow potential makes gas loss and stellar feedback dynamically important.
A dwarf spheroidal galaxy is a faint, diffuse, largely pressure-supported galaxy with little gas. A large dynamical mass-to-light ratio commonly indicates dark matter, subject to assumptions of equilibrium, member selection, and binary-star corrections. Its stellar light and total mass need not share one density profile.
A dark-matter core is an inner halo region whose density approaches a finite value rather than continuing as a steep cusp. Repeated rapid potential fluctuations driven by bursty stellar feedback can transfer orbital energy to dark matter and create such a core.
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