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Why Variables and Data types are required?

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Writing a program means playing with data information. Performing operations on data. And remember no any programming technology performing any operation on data actually. It is a processor's ALU unit which is responsible for operations. ALU fetch data from RAM, perform operations and store back the result on RAM. That's why operators are the same in every programming technology.
RAM made up of cells. and every cell has the size of one byte which is identified by a unique address Nowadays, there is RAMs are in gigabytes i.e. billions of cell on RAM. So much lookup time to find the values on RAM.

To optimize this lookup time Programming technologies reserve some space for themselves initially. When Any Programming technology requests to the processor for some operations on its values. It also specifies their unique names with the request. These names bind with the address of cells internally where values are stored. This will help to find the values immediately. This name is known as Variable Name.

 Variables are name of memory location.
But still, there is one problem to resolve. Data can be a number, alphabet, string, symbols or true/false. Different type of data takes a different memory size. The processor needs to know already that which kind of data is coming to the store. because it has to reserve memory for variables before storing them. So when we request to the processor to store the values we also tell the type of variable as Integer or String etc. These are called DataTypes 

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