The aim of this is first to increase your vocabulary, learning new words and reinforcing the ones you already know then listening to these words being spoken in various English accents. This is to improve your listening comprehension so that you will understand questions better.
The listenings come from the BBC website (please go there and see all the interesting things they have and do for learning English).
Many of these listenings focus on topical words or phrases and when they introduce new words or expressions they then explain them.