JavaScript Object is a non-primitive data type used to store collections of key-value pairs. It can hold properties (data) and methods (functions).

JavaScript is object-based — everything is treated as an object.

1. Object Literal: Directly define key-value pairs using curly braces.
2. Object Instance: Use the new Object() syntax.
3. Object Constructor Function: Use a function with this to assign properties.

Arrays can hold multiple objects. Each object can contain various properties.

const allows array modification (like push()), but not reassignment.

You can change the contents, but not reassign the variable itself.

Like arrays, objects declared with const can have their properties updated.

But reassigning the object is not allowed.