Pip
The smallest standard price move for a currency pair. For most pairs: 0.0001. For JPY pairs: 0.01.
A pip (percentage in point) is the base unit of price change. EURUSD moving from 1.0850 to 1.0851 is 1 pip. USDJPY moving from 149.50 to 149.51 is 1 pip. Pip value in dollars depends on your lot size, the pair, and your account currency.
Learn to actually use Pip.
Definitions are the easy part. The free first five modules put this on a real chart and make you do the work. No card required.