A violin bow is like a special stick that helps make music with a violin. Imagine a straight stick, but it has a nice curve in the middle. This curved stick is called the 'bow'.
Now, think of a ribbon that connects the two ends of the stick. This ribbon is made from thin, strong hair, often from a horse. When you move the bow back and forth on the violin strings, the hair on the ribbon rubs against the strings and makes beautiful sounds!