A borough is a town or district that has its own local government within a larger region. The word comes from an Old English term meaning a fortified town, and it's still used today in several English-speaking countries, though its meaning varies by place.

In New York City, the five boroughs (Manhattan, Brooklyn, Queens, the Bronx, and Staten Island) are like separate parts of one massive metropolis. Each borough has hundreds of thousands or even millions of residents and its own distinct personality, neighborhoods, and local government offices.

In Alaska, boroughs work like counties do in other states, organizing large areas for local services and government. Some parts of Alaska are so remote and sparsely populated that they aren't organized into boroughs at all.

In London, England, the city is divided into 32 boroughs, each managing local services like schools, parks, and waste collection for their area. The City of Westminster, for instance, includes famous landmarks like Buckingham Palace.

Whether you're talking about a neighborhood in New York or a district in London, a borough represents a community with its own identity and local leadership.