STAR is the acronym Situation, Tasks, Action, Results
It ensures that the Experience section of your C.V. is presented correctly.
The first 3 are straightforward, routine and easily completed.
Results is the section which can set you above all the other candidates.
The key to the job specification.
This is the job title.
If your current role then it should have some correlation to the job specification.
What you did from day to day in your duties for whatever the job title is.
How you did the tasks.
This is your chance to set yourself apart from other candidates.
The video explains exactly how you do this.