In this video, the teacher explains how writers can use relative adverbs to make their writing more specific and less wordy. The teacher provides examples and guides the students through exercises to practice using relative adverbs to describe how, where, when, and why actions are taking place. The students are also given the opportunity to revise a draft using relative adverbs, and the teacher emphasizes the importance of using relative adverbs to make writing easier to understand. Overall, the video aims to teach students how to effectively use relative adverbs in their writing.