Under this section information about the Reusable Component could be found. This are the reusable components
Reuse Component for HCM ESS apps (Fiori 2.0): App ID F2456
The services provided by the reusable component is used by several applications but cannot be used independently.
It's important to also maintain them updated.
Previous version: Reusable Component for Employee Lookup & People Profile : App ID F1387