What is the difference between variable initialization and variable definition?

Answer 1

Definition means where you define the variable that you will be using in your code

For example : int a;
//Here you defined the variable a, it means it will reserve a empty memory space for future values.

Initialization means assigning a value to variable.

For example : a = 10;
//Here we assigned value of 10 to the variable be already defined

-> note : you can also do definition and initialization at a time
For example : int a = 10;