Ceramic Tile is made from clay, natural minerals and water.  Glazed tile has a ceramic coating that gives the tile its finish and color.  Glazed ceramic tile is an excellent choice for interior floors and walls because it is:

• Easy care - Glazed ceramic tile resist odors, stains and dirt and can be cleaned with a sponge, damp mop or most ordinary household cleaners.
• Durable/Scratch Resistant - Professional installed ceramic tile outperforms and outlasts just about every other floor covering material.  Grades III and IV ceramic glazed tiles are very resistant to scratches and scuff marks.
• Environmentally friendly - Ceramic tile doesn't retain any allergans, bacteria or odors.
• Resistant to Fire/Water - Ceramic tile will not burn or give off toxic fumes nor will it absorb moisture - meaning common liquid spills in the kitchen are of little concern.

Definitions -

Ceramic tiles are a mixture of different clays pressed into shapes then fired at very high temperature, giving the tile extreme hardness.  Afterwards, the outside can be glazed or unglazed, depending on the application. 

Classifications:  Porcelain Enamel Institute Wear Ratings:

Group I - Tile suitable for residential bathroom installations where foot traffic is light.  Wall tiles are in this category; some can be used on floors.

Group II - Tiles for use in moderate traffic areas.  Not for floors with high traffic like foyers, kitchens, etc.

Group III - Suitable for most residential installations.

Group IV - Suitable for light to medium commercial installations and all residential installations.

Group V - Tiles for heavy traffic areas.  Also recommended for damp areas where safety is necessary, i.e., food service facilities, exterior locations, swimming pools, etc.