ETS software is only tool to program and download to KNX devices. The engineer normally will download 'products database' and import them into ETS.
In order to meet the availability of databases from manufacturers right in ETS, the KNX Association has allowed manufacturers to integrate 'online database' into ETS software to make it easier for users to access and search. However, not all KNX members have an Online Catalog. The video below shows you how to use KNX Online Catalog for your project.