Idea Wikipedia open wikipedia design. This article does not have any sources. You can help Wikipedia by finding good sources, and adding them. (June 2009) The Simple English Wiktionary has a definition for: idea. When a person thinks of something, that which he or she thinks about is called an "idea". Ideas are concepts created in the mind. No one really knows how this works. Ideas are a mental product. One idea can change the whole world. If someone has a better idea, they can sell it to others. Related pages[change | change source] Idealism Ideology This short article can be made longer. You can help Wikipedia by adding to it. This page is based on a Wikipedia article written by contributors (read/edit).Text is available under the CC BY-SA 4.0 license; additional terms may apply. Images, videos and audio are available under their respective licenses.