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A variable is a symbol and an allocation of memory wich contains content (integer char etc..) you can define. They may be in the scope of the whole program (global variables) or a procedure, function or method only (local variables).

How to assign values to variables

The character pair := (becomes) is called assignment operator: you assign the value of what is on the right side of the := character pair to whatever is on the left side of the := character pair.