•Why it earns a slot
The play is the definitive Shakespearean model for the battle-of-wits romantic comedy, and the Benedick-Beatrice courtship, driven entirely by competitive wit and mutual pride rather than conventional sentiment, has shaped the genre from Restoration comedy to modern romantic film.
In Messina, two courtship plots run in parallel: the straightforward romance between the young soldier Claudio and Hero is nearly destroyed when the villain Don John tricks Claudio into believing Hero is unchaste, causing him to humiliate her at the altar. Meanwhile, the sharp-tongued sparring partners Benedick and Beatrice are separately tricked by their friends into believing each loves the other, and the crisis over Hero's false disgrace finally pushes them to confess their genuine feelings. The plot unravels when the bumbling constable Dogberry's watch accidentally overhears Don John's henchman Borachio confessing the scheme, Hero's innocence is proved, and both couples are united in marriage.
This distillation is written from the freely available original, which is always the better read when you have the time: gutenberg.org.