What is the full form of nyc?

The full form of NYC is New York City. It's the most populous city in the United States. Using the abbreviation is actually quite helpful. It clearly distinguishes the city from New York State, which can prevent confusion. So when you see NYC, you know for sure they mean the city itself. You'll also often hear it called by its famous nickname, "The Big Apple." This shorthand is used globally in media, travel, and business.