Question

what is the use of ceramics

Answer 1

Ceramics such as alumina and boron carbide have been used in ballistic armored vests to repel large-caliber rifle fire. Such plates are known commonly as small arms protective inserts, or SAPIs. Similar material is used to protect the cockpits of some military airplanes, because of the low weight of the material.
Ceramics are generally thought of as inorganic and nonmetallic solids with a range of useful properties, including very high hardness and strength, extremely high melting points, and good electrical and thermal insulation. The best-known ceramics are pottery, glass, brick, porcelain, and cement.

Answer 2

 Bio-ceramics are used as dental implants and synthetic bones