In this page, you can enable your shop's webservice, so that third-party tools can access your data. This potentially makes it possible for interesting tools to help you or your customers make better use of your shop (such as mobile applications).
A web service is a method of communication between two electronic devices over a network. It relies on a known set of methods, formats and access rights, so as be able to use the webservice's content on any other authorized tool, and build upon the original content. Read more about it on Wikipedia: http://en.wikipedia.org/wiki/Web_service.
The page starts by listing the currently existing webservice keys in a table, if there is any. A webservice key is a unique access that you grant to a developer, which can be used to tie a tool to your shop. Share them sparingly, as you might not always want everyone to access your data.
Not any app can access your shop through the PrestaShop webservice: you decide which can, and what they are allowed to do. Every app has a unique connection key, with specific access rights.
The "Add new" button takes you to the webservice key creation form:
For security reasons, make sure your shop's server supports secure SSL connection!
The configuration is pretty easy:
Developers can find our documentation on how to build a tool around PrestaShop's webservice at this address: http://doc.prestashop.com/display/PS16/Using+the+PrestaShop+Web+Service.