Bonsai isn't a species but a centuries-old technique for training an ordinary tree into a miniature, sculptural version of itself — sometimes tended and reshaped across multiple human generations.
Originating in China and refined over centuries in Japan, bonsai practice uses careful pruning, wiring, and root restriction to keep a full-sized tree species permanently small, and the resulting miniature trees are treated as living works of art passed down as family heirlooms.
Bonsai care depends on the species being trained, but most need bright light, careful watering (checking the soil daily since shallow pots dry out quickly), and regular light pruning to maintain their miniature shape. Repotting every couple of years to trim roots keeps growth in proportion to the pot.
Beginners often find success starting with a hardy outdoor species like juniper rather than an indoor tropical variety, since outdoor bonsai are generally more forgiving of a novice's learning curve.