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JavaScript let, const, and var
JavaScript variables give names to values. They make it easier to describe information a program needs, including details that may change while someone uses it.
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A selected item, a running count, and a page title are different pieces of information. Naming them clearly makes the behaviour behind an interface easier to follow.
A changing value can keep the same purpose
A variable connects a name to information used by a program. The selected category may change from books to music while still representing the same choice in the interface. A useful name describes that role, rather than only describing the first value it receives.
JavaScript also distinguishes bindings that can be reassigned from those that cannot. That distinction concerns the name's connection to a value; it does not make every object associated with a fixed binding unchangeable. These are separate parts of understanding how state evolves.
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