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Aren't apis pre-existng code...? that people make so you don't have to code it yourself?
These days it's usually meant as a API for a web site or other service - like how you can make a Twitter app for the iPhone and it uses the web-accessible Twitter API instead of screen scraping the site.Pre-existed code is usually called a library. The API is just how you would interact with libraries possibly because you don't own the library or the person who wrote the library wants to restrict how people use it.