Google's AdWords API service lets developers design computer programs that interact directly with the AdWords platform. With these applications, advertisers and third-parties can more efficiently - and creatively - manage their large or complex AdWords accounts and campaigns.

Flexible and Functional
What can you do with the AdWords API? That all depends on your creativity and advertising needs. Some possibilities include:
Generating automatic keyword, ad text, URL, and custom reports
Integrating AdWords data with databases, such as inventory systems
Developing additional tools and applications to help you manage accounts

Multi-Language Compatibility
To make your programming environment even easier, the AdWords API SOAP interface supports a growing number of languages - including Java, .NET, Perl, PHP, Python, OCAML, Ruby and XML.

I thought API means application program interface. What does that Google API stand for? As it relates to some computer program it must be an application. Did you ever use it for your ads?