Call( ) and Apply( ) in JS is most commonly used to invoke a method or used in constructors & classes for Inheritance purposes.

The first parameter to be passed in these two methods is an Object (current reference/current context). The difference comes in the concluding parameters.

Apply( ) takes Array as it’s next parameter. The array represents the arguments for the target method.

Call( ) takes arguments in comma separated format.

Usage:
Use apply ( ), if you don’t know the number of arguments you will be passing, or if they are already in an array.
With call ( ), you can write a method once and then inherit it in another object, without having to rewrite the method for the new object.

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