Open interfaces allow for the linking of offers
In order to handle software regardless of device boundaries, it is essential to have open interfaces:
- Web 2.0 is open.
 - Most applications are based on Open Source software.
 - By using open interfaces (APIs) offers and data can be combined with each other.
 - RSS Feeds and Widgets allow for the integration of contents on special sites.
 - Standards are given and are constantly being further developed by the World Wide Web Consortium.
 
 
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| Open interfaces combine different offers. | 
(According to O’Reilly: Web 2.0 for Participation)
