Outbound Glossary
SDR
The role that opens conversations and hands them over. Outsourcing it is the same decision as hiring one, priced differently.
A sales development representative prospects, makes first contact and books qualified meetings for someone else to run. BDR is the same role under a different name in most companies.
The reason the role is so often outsourced is that it needs tooling, data, deliverability and a volume of practice that one new hire cannot assemble alone in their first six months. The comparison that matters is not agency versus nothing, it is agency versus one person plus the stack they would need.