Whats the difference btwn the city "bank " and the square mile with its skyscrapper in canary warf (london)

Hello, trying to understand the difference between the city (bank station area) and the square mile (canary warf station) with its skyscrapper.
Answer
The square mile is the city of london - roughly from st pauls in the west to liverpool street on the east - bank is bang in the middle of the square mile. canary wharf is another area of london and is further east, it was originally the docks area of london mainly containing warehouses, now it is a second financial and commerce area of london