What is the difference between declaration and definition in C#?

Declaration means only declaring the variable and allocating memory, but not setting any value.

But definition means that the variable has been initialized.

The same is true for variables, arrays, collections, etc.

Variables

Declare variables.

int x;

Let's define and assign a value.

x = 10;

Array

Declare an array.

int [] n // declaring
int n= new int[10]; // initializing

Let's assign a value.

n[0] = 100;
n[1] = 200

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