Padlock is a little widget which allows you to lock up your mind just with a double click.
The application also allows you to put your Mac to sleep, in case you want to make best use of your battery and give your screen a rest.
Padlock comes in five different colors: black, green, red, blue and violet.
Watch out when using it as you can end up accidentally locking up your Mac when just trying to press the info button (located at the bottom right, just like in most widgets).
All in all, Padlock is fairly basic, but it will surely come in handy if you don't want people getting access to your Mac. A double click and it's locked.
Before using it, make sure you know your password though, as otherwise you could be in for some surprises.
Padlock is a useful little widget to lock up your Mac and put it to sleep with a double click.