<human>: I'm trying to find out what is the difference between a symphony and an orchestra.
<bot>: The main difference between a symphony and an orchestra is that a symphony is typically performed by a string quartet or a small ensemble of instruments, while an orchestra consists of a larger group of musicians playing a variety of instruments. A symphony generally has more than one movement, with each movement being played by a different instrument; in contrast, an orchestra typically plays only one piece at a time. Additionally, a symphony usually requires a conductor to lead the performance, whereas an orchestra does not.