Period and Frequency
Period: How long it takes to complete one cycle
A slow Ferris wheel might take a half hour to complete one full turn
Every 24 hours, the earth spins once on its axis
How cool loose fitting pants are repeats every quarter century
Frequency: How many cycles happen per unit of input (e.g. "per second" or "per year")
A slow Ferris wheel might spin 2 times per hour
The earth spins on its axis 7 times per week
Loose pants are cool 4 times per century
Period and frequency are inversely proportional!