Glycolysis is a process that occurs in the cytosol of cells. This is a process that releases energy from glucose by the creation of molecules of high energy compounds like ATP, NADH and FADH2.
Glycolysis can occur in many ways each following a different set of individual steps. The processes that constitute the different pathways of glycosis can be generally divided into two categories. The first category consists of processes that consume energy by utilizing ATP and the other category of processes that release energy and create ATP among other high energy compounds.
The net output of the glycolysis of one glucose molecule is 2 molecules of NADH and two molecules of ATP.
Refer the link provided for the detailed pathway of glycolysis.