How does Watson Assistant differ from Watson Discovery service?

Watson Assistant strives to answer the frequently asked, whereas the Discovery service strives to provide passages for the esoteric inquiries

Watson Assistant is used mainly with chatbots and virtual agent systems; whereas the Discovery service is used mostly by researchers trying to find the relationship of entities and other enrichments

With Watson Assistant, we enter the response, whereas with Discovery service, the API retrieves the most relevant passage from ingested data

All the above remains true