A hearse is a funerary

Funeral

A funeral is a ceremony for celebrating, sanctifying, or remembering the life of a person who has died. Funerary customs comprise the complex of beliefs and practices used by a culture to remember the dead, from interment itself, to various monuments, prayers, and rituals undertaken in their honor...

 vehicle

Vehicle

A vehicle is a device that is designed or used to transport people or cargo. Most often vehicles are manufactured, such as bicycles, cars, motorcycles, trains, ships, boats, and aircraft....

 used to carry a coffin

Coffin

A coffin is a funerary box used in the display and containment of dead people – either for burial or cremation.Contemporary North American English makes a distinction between "coffin", which is generally understood to denote a funerary box having six sides in plan view, and "casket", which...

 from a church or funeral home

Funeral home

A funeral home, funeral parlor or mortuary, is a business that provides burial and funeral services for the deceased and their families. These services may include aprepared wake and funeral, and the provision of a chapel for the funeral....

 to a cemetery

Cemetery

A cemetery is a place in which dead bodies and cremated remains are buried. The term "cemetery" implies that the land is specifically designated as a burying ground. Cemeteries in the Western world are where the final ceremonies of death are observed...

. In the funeral trade, hearses are often called funeral coaches.
Originally, an elaborate framework would be erected over a coffin or tomb to which memorial verses or epitaphs were attached. It was then put on the top of horse-drawn carriages, looking much like a luggage rack. Today, the original hearse remains acknowledged by the bit of scroll work or stretched-out "S" on the side of a funeral coach, called Landau bars http://wiki.answers.com/Q/What_is_the_s_scroll_on_a_hearse_called.

Hearses were originally horse-drawn, but silent electric motorised carts were introduced as horses began to be phased out as transportation.