The kf5-kded-devel package contains libraries and header files for developing applications that use kf5-kded.
acquired package info from repodata DB: repodata/1878cc60a19e65efc93d1a539275c5a6799b0acbd7796ee105712c44cae47ab4-primary.sqlite.bz2
KDE Frameworks 5 Tier 3 addon with extensible daemon for system-level services
KDED stands for KDE Daemon which isn't very descriptive. KDED runs in the background and performs a number of small tasks. Some of these tasks are built in, others are started on demand. Custom KDED modules can be provided by 3rd party frameworks and applications.