Time signature: An indication of rhythm following a clef, generally expressed as a fraction with the denominator defining the beat as a division of a whole note and the numerator giving the number of beats in each bar.
A time signature is a type of way to describe how the beat acts. For instance, if you've ever heard the pop song "Shake it Off" - Taylor Swift, you can count 1, 2, 3, 4. This means the are four beats (pulses) in each measure and each note is worth one beat
