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`10`	`10`	`## Variable scope`
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	`12`	`+The scope is the current context of execution. The context in which values and expressions are "visible," or can be referenced. If a variable or other expression is not "in the current scope," then it is unavailable for use. Scopes can also be layered in a hierarchy, so that child scopes have access to parent scopes, but not vice versa.`
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`12`	`14`	`### Global scope`
`13`	`15`	A variable declared outside of all the function or without a `var` keyword is a global variable in Javascript. This variable can be accessed from anywhere in the program.
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