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Glass is a good thermal conductor.
Glass is an electrically insulating material: it does not conduct electricity.
When light falls on glass, part of the light is reflected at the surface, part of the light is absorbed in the glass, and part of the light is transmitted.
If most of the light is transmitted, the glass is transparent. By colouring the glass or changing its composition, it is possible to transmit selectively some wavelenghs of the spectrum.
Common glass does not transmit
ultra-violet radiation (short wavelengths):
you will not get a tan behind a window!
However it does transmit
infrared radiation (long wavelengths): this is why it is always hot
behind a glass window.