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A perfect mirror is a theoretical mirror that reflects light (and electromagnetic radiation in general) perfectly, and doesn't transmit it.
Domestic mirrors are not perfect mirrors as they absorb a significant portion of the light which falls on them.
Dielectric mirrors are glass or other substrates on which one or more layers of dielectric material are deposited, to form an optical coating. A very complex dielectric mirror can reflect up to 99.999% of the light incident upon it, for a narrow range of wavelengths and angles. A simpler mirror may reflect 99.9% of the light, but may cover a broader range of wavelengths.
A new type of "perfect mirror", developed in 1998 by researchers at MIT*, is a hybrid made of thin films of metals and dielectrics. These unusual mirrors are very efficient reflectors over a broad range of angles and wavelengths, and are insensitive to polarization.
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"Perfect mirror"