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When i look at magento 2 core, in some modules API directory is present and in some modules there is no API directory.

API Directory is used for implementing Web services(SOAP,REST) or it has other purpose too??

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Api directory have repositories.

It Contains set of code that third-party developers can call, implement, or build as a plug-in. Magento guarantees that this code will not change in subsequent releases without a major version change.
Public interfaces for a module are marked with @api annotation.

In general, the purpose of a repository is to hide the storage related logic. A client of a repository should not care whether the returned entity is held in memory, in an array, is retrieved from a MySQL database, fetched from a remote API or from a file.
Magento 2 repository methods can easily be exposed as API resources, making them valuable for integrations with third party systems or headless Magento instances.

UseFul Links :
http://devdocs.magento.com/guides/v2.2/extension-dev-guide/api-concepts.html http://vinaikopp.com/2017/02/18/magento2_repositories_interfaces_and_webapi/

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