JavaScript variables hold (or store) data (or values). The type of data variables that they hold is called the data type. In JavaScript, there are seven different data types: number, string, Boolean, null, undefined, symbol, and object.
When it comes to holding objects, variables hold the object reference (that is, the memory address) instead of the object itself. If you're coming from a C/C++ background, you can relate them to pointers, but not exactly.
All data types other than objects are called primitive data types.
The arrays and functions are actually the JavaScript objects. A lot of things are objects under the hood.
