The video tutorial introduces the OW sound, a digraph formed by the letters O and U. The teacher uses a magic box to find words like 'house', 'mouse', and 'loud' that contain the OW sound. Students are guided through writing the OW sound using 'magic fingers' and practice reading words such as 'out', 'loud', and 'shout'. The lesson concludes with encouragement for students to think of their own OW sound words.

What new insight or understanding did you gain from this video?