In the majority of the world where it's not Britain the definition of city is reasonably reasonable.
In Japan, a city is any settlement with more than 50,000 people.
In the USA, a city is anywhere with its own incorporated government.
But Britain, as per ushe, has its own special way of doing things.
Here is a map of all 76 places in the UK that are officially classed as cities.
The usual ones you've heard of are there Liverpool, Manchester, Bradford, Leeds, and so on.
But among them are some surprising and seemingly unworthy cities. Ely with just 20,000 people, Ripon with just 16,000 people.
And St Davids with less than 1,500 people. Barely enough for a flash mob.
And oppositely there are some very notable places that are mysteriously not on this map. Where's Reading? Or Northampton? Or Bournemouth?
The most surprising omission from this list is none other than London. Britain's capital city is technically not a city.
