Most garage doors are either wood or steel. 
Wood doors offer a wide variety of options. You can find anything from standard raised panel designs to doors that mimic the ornate styles commonly used on the carriage houses of the 18th and 19th centuries. Wood doors are also available in several species, either paint or stain grade. 

Steel doors are usually more economical than wood doors and are the most common type of garage door. Most manufacturers offer several colors out-of-the-box. You can also paint the door to match your home. There are three distinct types of steel doors:

Single layer doors are stamped from a single sheet of galvanized steel. These are usually the most economical of all steel doors.

Double layer steel doors have a galvanized steel skin on the outside with a thick layer of either polystyrene or polyurethane as a backer. The backer provides soundproofing and additional insulating value to the door.

Triple layer doors are constructed of the same materials as double layer doors with the addition of a galvanized skin on the inside to protect the polystyrene/polyurethane from damage. The additional layer of steel makes triple layer doors the strongest, most secure and most soundproof of all garage doors. These are also available with thicker insulation for greater R-Value.