What is the difference between Downbeat and Upbeat?

Both the downbeat and the upbeat exist in measured music, and both are important to create decent rhythm. A downbeat starts a rhythm, and it is the start of a unit of rhythm. An upbeat, on the contrary, marks the beginning of the next downbeat in a piece of measured music. Downbeats are the numbers 1,2,3, and 4 in rhythm while the ends are upbeat.

During a downbeat, the conductor will make a downward stroke while an upward stroke is done to indicate an upbeat. A downbeat would be the first beat while an upbeat precedes the beginning of the next downbeat.