variable can be used to store temporary data that can be altered, or varied.
Where Variables are stored?
variables are held in the computer's memory (RAM). This means that it is much faster to store and retrieve the data.
variables have a limited lifetime. When your visitors close the page or move to a new one, your variables are lost, unless you take some steps to save them somewhere.
Rules for declaring Variables
Each variable is given a name so that you can refer to it elsewhere in your code. These names must follow certain rules.
- Each variable name should be unique, else, overriding will occur.
- Variable names can contain letter, numbers, underscores and dollar sign.
- Variable names must begin with a letter, underscores, or dollar sign.
- Variable names are case sensitive (a and A are different variables)
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