Weak AI is a type of AI which is designed to focus on a narrow task. Siri is an example of weak AI, it is programmed to be intelligent with a database pre-defining its capabilities. The narrowness of its functionality is noticed when it is unable to respond to a conversation it is not programmed for. Another example could be a game of chess, where a human plays against a computer user and gets impressed by its moves whereas the computer is not thinking but merely acting on the moves that are programmed and saved in the database. Weak AI concentrates on the technology needed to carry our pre-planned moves in order to accomplish a certain task, whereas Strong AI focuses on intelligent machines thinking like humans. It refers to the machines that behave skillfully and flexible like humans.