business cycles

business cycles are basically short term fluctuations in broad macroeconomic variables.
what does one mean by the above mumbo jumbo?
1. for the time being imagine business cycles as something similar to sea waves, got it?
2.short term means that the time period in question is less than 10 yrs.
3.macroeconomic variables here refers to GDP(don't ask me whats dat!), rate of inflation and not to forget unemployment rate.

dat's all for now folks!!!