JavaScript Variables : are like containers used to store data values.
JavaScript Identifiers :
JavaScript variable names are called identifiers.
Identifiers should have short and descriptive names.
general rules for identifiers are:
1) Names can contain letters, digits, underscores, and dollar signs.
2) Names must begin with a letter, can also begin with $ and _ .
3) Names are case sensitive.
4) Reserved words cannot be used as names
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