* Block scoping
> Declared inside a block
> It is only available inside that block
Asynchronous : More than one at a time
Callback function or some other fucntions are asynchronous .
Wait 3 seconds +click between that 3 seco
Anything created outside the functitons ! Even if we dont have anything Javwscript
engines will automatically crate some for us !
Window and this.
1. Creation Phase
2. Execution Phase
Creation Phase : First Phase