Difference between some similar-looking Excel functions

SUM - Function SUM sums up all numerical values within a selected range.

SUMIF - Function SUMIF sums up all numerical values within a selected range with one special condition criteria.

SUMIFS - Function SUMIFS sums up all numerical values within a selected range with multiple special condition criteria.

COUNT - Function COUNT counts all numerical values within a selected range.

COUNTIF - Function COUNTIF counts cells specified by a given condition or criteria.

COUNTIFS - Function COUNTIFS counts the value of those cells within a range which meets multiple criteria.