Bases Point is the amount of change in the hundredth of a number that has moving during a period of time.
For example, let’s say a stock started at 1.00% for the day and at the end of the day when the stock market close. The stock ended at 1.50%.
Someone could say that the stock move up 50 bases point for the day reference that it’s the hundredth of the number that change. This term is usually used when talking about interest rate and financial lingo.