  White dwarfs are the remnants of stars not massive enough to become
supernovae. This review explores the concept of strange dwarfs, a unique class
of white dwarfs which contain cores of strange quark matter. Strange dwarfs
have different sizes, masses, and evolutionary paths with respect to white
dwarfs. They might form through the accumulation of normal matter on strange
quark stars or by capture of strangelets. The stability of strange dwarfs has
been debated, with initial studies suggesting stability, while later analyses
indicated potential instability. This review revisits these discussions,
focusing on the critical role of boundary conditions between nuclear and quark
matter in determining stability. It also offers insights into their formation,
structure, and possible detection in the universe.
