1) The term "cloud computing" refers to the delivery of computing services, including storage, databases, and software, over the internet rather than on a local server.

2) The word "guitar" contains three vowels: U, A, and I.

3) The Great Wall of China is not visible from space without aid, contrary to popular belief.

4) Democracy is a system of government in which power is vested in the people, who exercise it through elected representatives. It allows for political participation, freedom of speech, and protection of individual rights and liberties.