what is adwords API ?

The Google AdWords Application Programming Interface (API) is designed for developers representing large, tech-savvy advertisers and third parties. This includes agencies, search engine marketers (SEMs), and other online marketing professionals who manage multiple client accounts or large campaigns.

The Google AdWords API lets developers build applications that interact directly with the Google AdWords server. With these applications, advertisers and third parties can more efficiently and creatively manage their large or complex AdWords accounts and campaigns.

How you can use the API 

• Automatically generate keywords, ad text, landing pages, and custom reports.

•  Integrate AdWords data with your inventory system to manage campaigns based on stock. 

• Develop additional tools and applications to help you manage accounts.

Getting started with the API

Because implementing the AdWords API takes technical know-how and programming skills, best results can be achieved by advertisers who employ software developers. 

The API is flexible and functional -- you can use it to build an application that meets your needs. Using the API, you can: 

 And you can even develop in the language of your choice. The AdWords API SOAP interface is supported by all popular programming languages, including Java, PHP, Python, .NET, Perl, and Ruby.

Signing up is easy. All you need is an active AdWords account. Once you've registered as a developer, you can access the AdWords API Center to manage your token and budget settings. Your developer token is a unique combination of letters, numbers, and characters that identifies your AdWords API activity. It's your key to talking to the AdWords server and your clients' AdWords accounts

AdWords API 

An advanced feature that lets advertisers interact with and make changes to their AdWords account through applications they create. The AdWords API (application programming interface) allows developers to create and use applications that interact directly with their account details on the AdWords server. The API can help advertisers efficiently manage large AdWords accounts and campaigns. For example, you can compile your AdWords data to use with other systems like inventories, generate regular reports, and make campaign adjustments in bulk. To use the AdWords API, you'll need a My Client Center (MCC) account and a Developer Token. The AdWords API is a good option for advertisers who have a developer or programmer who has the technical skills. If you don't have these resources but still want an extra tool to help manage large changes to your account, try AdWords Editor instead.