What's the difference between Calls and Completed calls in Explore?

Question

In Explore I see two metrics, Calls and Completed calls, how are they different?

Answer

The Calls metric shows you all calls received by your account regardless of completion status. This includes calls that connected to an agent, calls that were never answered, and calls that were abandoned in the queue, in a voicemail, or in the IVR. 

The Completed calls metric only shows calls that successfully connected with an agent. 

For more information, see these articles: Metrics and attribute reference for Zendesk Talk.