Variable

A variable is like a box in memory where you store a value.

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Explicit Typing

Here, you’re telling the compiler exactly what type of data the variable will hold.

int number = 10;
double price = 12.5;
float rate = 3.14f;
string name = "Sara";
bool isActive = true;

Implicit Typing

You just assign the value, and C# automatically figures out what the variable’s type should be.
You can only use it when you provide an initial value, because C# needs that value to determine the variable’s type.

var x;      // Error! No initial value provided
x = 5;

Keep in mind that once a variable’s type is defined, it can’t be changed later.

When should you use var?

When the type is completely obvious from the value,But when the type might be unclear, it’s better to write it explicitly