A variable is a technique of mentioning to a memory location usage in computer program. This memory position holds values- possibly text or numbers or more complex sorts of data like payroll record.Operating Systems load software package into diverse parts of RAM consequently there is no technique of knowing precisely which memory location would hold a precise variable beforehand the program is run. By providing a variable a symbolic designation like “employee_payroll_id” the interpreter or compiler could always work out wherever to stock the variable in memory.
Data in a PC:
Computer would place variables in diverse locations every time our program is run. Though our program distinguishes exactly 
where data is situated. We do this by generating a variable to mention to this and then let compiler handle all the messy particulars about where this is essentially located. This is far more significant to us to distinguish whatever sort of data we would be storage in the location.
In warehouse, our crate may be on segment 5 of layer 3 in drinks area. In the personal computer, the program would know precisely wherever its variables are positioned.
Variables are Short-term:
They exist only as extended as they are required and are then disposed of. Additionalequivalence is that variables are like figures in a calculator. Immediately you hit clear or power off switches, display figures are lost.
What is a Variable Type?
In current programming languages, variables are professed to be of a sort.
Separately from statistics, the CPU does not create any kind of difference about the statistics in its memory. This treats it as anassemblage of bytes. Modern CPUs could frequently handle both floating point and integer and arithmetic in hardware. Compiler has to produce different machine code commands for each sort, so knowing whatever the sort of variable helps thiscreate optimal code.
Conclusion:
Variables are vital to procedural programming, nonetheless this is important not to get too suspended up on the fundamental implementation without you are doing methods programming or writing apps that have to track in lesser amount of RAM.
You can get more information from below video:
Learning C Programming Lesson 3 Variables
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