Lose their leaves!
Semi-deciduous plants lose their leaves for a very short period, such as Mimosa and Oak.
Deciduous Example: Red Maple (pic courtesy of arborday.org) Brings color to your landscape year-round. Green stems turn red in winter, new leaves are red-tinged, turning to green. Fall color is deep red or yellow. Flowers are also red. Fast growing and tolerant of many soils. Grows to 40' to 60', 40' spread.
(zones 3-9)