Simply put, this is a relation between the two issues, in which one depends in some way on the other. Eg. you have tickets:
You could say that XYZ-2 is blocked by XYZ-1, because you don't want to start implementation of feature ABC until research is done.
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event
You're one step closer to meeting fellow Atlassian users at your local event. Learn more about Community Events