Outbound Glossary
Waterfall enrichment
Asking providers in sequence until one answers. Better coverage per contact, and a longer list of places your data has been.
Waterfall enrichment queries one provider, and if it returns nothing, passes the record to the next. Chaining four or five lifts total coverage well above any single source and you pay only where a provider delivers.
The side effect is worth naming: each provider in the chain receives the record, so the number of companies holding your prospect data equals the length of your waterfall. That is a question a European buyer may well ask, and the answer belongs in your own data map.