Jonathan T. answered 09/16/20
Calculus, Linear Algebra, and Differential Equations for College
There are three forms:
EF (echelon): Lower triangular with any diagonal elements,
REF (reduced echelon): Lower triangular with 1's for diagonal elements,
RREF (row reduced echelon): Lower and upper with 1's for diagonal i.e. only the pivots remain.
Here is video I made: https://www.youtube.com/watch?v=4zPWM8OCPqA&feature=youtu.be