Variables should be declared in the C program before to use. Memory space is not allocated for a variable while declaration. It happens only on variable definition. Variable initialization means assigning a value to the variable.

What is an initialisation in C?

In computer programming, initialization (or initialisation) is the assignment of an initial value for a data object or variable. ... Initialization is done either by statically embedding the value at compile time, or else by assignment at run time.

What is meant by initialization?

: to set (something, such as a computer program counter) to a starting position, value, or configuration.