This video discusses the rules for using "a" versus "an" in English. It explains that "a" is used before words beginning with consonant sounds, while "an" is used before words beginning with vowel sounds. Some exceptions are noted, such as using "an" before words beginning with "h" but with a vowel sound like "hour" or "honest." The video also provides examples like "a car" versus "an apple" to illustrate the rules. Finally, it gives viewers a homework assignment to practice using articles correctly with drawings.