A flagship is the most important or impressive thing in a group, the one that represents everything the group stands for.

The word originally came from naval fleets, where the flagship was the ship carrying the fleet's commanding admiral. This ship would fly a special flag to show which vessel was in charge, and other ships would follow its lead in battle or when sailing in formation.

Today, we use flagship much more broadly. A company's flagship product is its best or most famous item, the one it's most proud of. The iPhone was Apple's flagship product for many years. A flagship store is a company's biggest, fanciest location, like the massive LEGO store in New York City with its giant LEGO models and special experiences you can't find anywhere else.

Universities talk about their flagship campus, meaning their main or most prestigious location. A flagship program might be a school's most popular or successful offering, like a debate team that wins national championships year after year.

When something is described as flagship, it means it's leading the way, setting the standard, and showing everyone what the organization can do at its very best.