A laptop is a type of computer that designed for portability, you can carry and take it with you then use in different surroundings other than your home.
So, all laptops have the battery (for using it without being plugged into a power outlet) alongside with AC power adapter (for recharge the battery).
A laptop comes as a whole with an integrated flat-screen, keyboard, touchpad or trackpad (which control the pointer on the screen), and several ports for connectivity.
The L-shape design allows the screen to be lowered and closed for on the go purpose. This machine commonly cost more than desktop computer even with the same performance because of the design and compile.