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What is Glaze?

Glaze

Transparent vitreous coating for pottery and porcelain, which gives the object a shiny, protective finish and helps to keep it from leaking and chipping. Glaze is applied by dipping a formed ceramic body into it or by painting onto the surface. It is fixed by firing in a kiln.
Different mineral glazes will combine chemically with different bodies (according to the minerals present in the clay). Glazes may be alkaline, lead, leadless, tin, salt, or feldspathic. Glazed pottery is first known from the mid-to late-Neolithic in Egypt, where glass was first made.

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