What does Cast sender mean?
A Cast sender is the application or device that initiates and controls a Google Cast session. It provides the user interface for selecting a receiver and content, but the receiver can perform the actual media playback through its own supported environment.
Why it matters
This separation explains why phone playback does not guarantee receiver playback. The handoff needs to provide an accessible source in a supported format, including any required account context. Device discovery is only the first stage. Keep private media URLs out of public testing services when diagnosing a failed handoff.
A practical example
For example, a phone can list a television correctly and still receive a playback error after selecting it. Report that discovery succeeded and identify the app, receiver and failure stage rather than treating the whole process as one generic connection problem.
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Related terminology: Cast receiver, Catch-up television.
For practical setup and troubleshooting, browse the journal or support guides.