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2. It’s All Just Code: Under the hood > Your programs use variables to work wit...
Your programs use variables to work with data
When you get right down to it, every program is basically a data cruncher. Sometimes the data is in the form of a document, or an image in a video game, or an instant message. But it’s all just data. And that’s where variables come in. A variable is what your program uses to store data.
Whenever you declare a variable, you tell your program its type and its name. Once C# knows your variable’s type, it’ll keep your program from compiling if you make a mistake and try to do something that doesn’t make sense, like subtract “Fido” from 48353.
