Other forms: still lives; still lifes
A still life is a painting of something that's not alive: usually something like flowers or a bowl of fruit.
There are many types of paintings, such as portraits, which focus on realistically representing a person. Another type is the still life. In a still life, there is something like a bowl of fruit or a flower. The key is that a still life features an inanimate object. You could do a still life of a bicycle, a lamp, a pillow, or a guitar — but not a dog, because a dog is alive.