Ceramics are covalent compounds containing metal and non-metal atoms primarily held in covalent and ionic bonds. Generally, ceramics are made by taking mixtures of earth elements, powders, water and clay. This mixture is shaped into the desired form and is then fired in a high temperature oven. Ceramics are then painted with glazes which are waterproof and decorative. At elevated temperature, ceramics have high hardness, high melting points, excellent chemical corrosion resistance and good mechanical properties. Some ceramics are good dielectrics or insulators, whereas others are good electrical or thermal conductors. Ceramics are widely used in our daily life. Glass, plates, bricks, tiles and sanitary ware are some examples of the ceramics we see every day. Ceramics can also be found in products like automobiles (sparkplug), phone lines and watches. They are even used in space shuttles and aircrafts. Ceramics can be broadly classified into two categories: traditional and advanced. Traditional ceramics include clay products such as cement and glass, whereas advanced ceramics consist of pure oxides, nitrides, carbides and many others.