No matter what plant or tree it is, they all need sunlight to thrive, even if it is not direct sunlight. The sun helps them make their own food that sustains them for their entire life. If the plant or tree doesn't receive enough sun, they will not be able to make their food and die early. 
If you have just begun caring for a bonsai tree, you might wonder whether bonsai trees need sunlight. If you are, you are in the right place. So, do bonsai trees need sunlight?