Akonadi is a storage service for personal information management (PIM) data and metadata named after the oracle goddess of justice in Ghana.
It is one of the “pillars” (core technologies) behind the KDE SC 4 project, although it is designed to be used in any desktop environment. It is extensible and provides concurrent read, write, and query access.
Akonadi provides unique desktop-wide object identification and retrieval.It functions as an extensible data storage for all PIM applications. In KDE 3 each PIM application had different data storage and handling methods, which led to several implementations of essentially the same features. Besides data storage, Akonadi has several other components including search, and a library (cache) for easy access and notification of data changes.