Well, according to the Wikipedia:
http://en.wikipedia.org/wiki/Sdk http://en.wikipedia.org/wiki/Api Quote:
Originally Posted by Wikipedia
A software development kit (SDK or "devkit") is typically a set of development tools that allows a software engineer to create applications for a certain software package, software framework, hardware platform, computer system, video game console, operating system, or similar.
Quote:
Originally Posted by Wikipedia
An application programming interface (API) is a source code interface that a computer system or program library provides to support requests for services to be made of it by a computer program. An API differs from an application binary interface in that it is specified in terms of a programming language that can be compiled when an application is built, rather than an explicit low level description of how data is laid out in memory.
In other words, an SDK is a bunch of files that you use to compile functionality into your code, whereas an API is more or less a description of the function calls you need to make to get your code to run somebody else's.