Scope in JavaScript refers to context (or portion) of the code which determines the accessibility (visibility) of variables. In JavaScript, we have two types of scope, local , and global.

Tips for naming JavaScript variables Dynamic typing and JavaScript variables How to work with string variables What you need to know about variable scope What is a user-defined variable in JavaScript?

i.e. intuitively it looks like the variable will only be available within the block but it is accessible outside the block .. in javascript's case, because var doesn't make a block level declaration.