Federated Search involves querying multiple data sources independently and then merging the results into a single result set. In this approach, each data source is searched separately, and the results are then combined and presented to the user.
Federated search can be useful when searching a diverse set of data sources, each with its own unique search capabilities and user interfaces. On the other hand, Federated Search can result in slower search performance and can be difficult to implement if there are significant differences in how the data is stored or represented in the various data sources.