DiSC online programs are tools with a wide variety of applications in organizational effectiveness, leadership, team building, coaching, and hiring. These instruments provide keen insights into the factors that motivate different people, and which manifest themselves as different behavioral styles. Employees who learn about DiSC are better able to engage with colleagues for more constructive (and productive) workplace relationships.
There are several DiSC online instruments. Two good entry points are DiSC Workplace and the DiSC Classic 2.0. Workplace is the most powerful and sophisticated online DiSC program, where Classic 2.0 is an older generation of products and not quite as robust. Both of them are "generalist" assessments, as opposed to other online DiSC programs designed for sales teams, managers, etc.