A parade is an organized procession of people along a street, often in costume, and often accompanied by decorated vehicles called "floats" or sometimes large lighter-than-air balloons with complex shapes. Parades are held for a wide range of reasons, but are usually celebrations of some kind. Protest demonstrations also sometimes take the form of a parade, but are usually referred to as a march in these cases instead.
The parade "float" was originally named this because the first floats were decorated barges that were towed along canals with ropes held by parade marchers on the shore. Today, parade floats are traditionally pulled by motor vehicles or powered themselves and may be decorated with flower blossoms.