What is a Therapy Dog?

So many people don't really understand what a therapy dog is. I've had many people think I am training an ESA or Service Dog. When I explain that a therapy dog provides comfort to others, one person actually said, "Oh good. I thought you were making one of those fake service dogs". A friend sent me this beautiful video that demonstrates perfectly what a Therapy Dog is:

https://www.msn.com/en-us/video/animals/therapy-dog-surprises-a-brave-boy-fighting-leukemia/vi-AA20RCic?ocid=socialshare