Policyholder taxation: the personal allowance

The core reading mentions that a policyholder can receive tax relief on contributions up to £3,600 or their full taxable UK earnings if higher. What is the relevance of £3,600 here? If I say the policyholder receives tax relief on pension contributions up to their taxable UK earnings, how is this different from the above?

 

Hi Francis

Thanks for that clarification. I got the point.