It's an acronym for the order of operations you perform while doing algebraic equations
Parenthesis (the highest priority, you always do these first)
Exponents
Multiply/Divide
Addition/Subtraction (the lowest priority, do these last)
Parenthesis (the highest priority, you always do these first)
Exponents
Multiply/Divide
Addition/Subtraction (the lowest priority, do these last)