DISC personality profile assessment

[Lamar Washington]

I have been hearing a lot about the DISC personality assessment on several podcasts and YouTube videos and I'm still not sure exactly what it does. When I search it in google many fake assessments come up. 

For those who have already taken it, how did you like it, and what are the benefits of the assessment in your opinion?

Also,
Where can I go to take the real DISC personality profile assessment?