This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
The sets are said to be disjoint if they have no common element.     
example;-{1,2,3}  {4.5,6} are disjoint sets because they have no common element.