Why is a channel needed in unbuffered transmission if data flows from stack to stack? What role does the channel play?

In Go, an unbuffered channel is used for synchronization and data transfer between goroutines. Even if data is passed directly from stack to stack, the channel blocks the sender until the receiver reads the data.

The role of the channel in this case:

• Synchronization: the sender and receiver synchronize, ensuring data is transmitted and received in a specific order.
• Transfer safety: the channel provides safe data exchange between goroutines without race conditions.
• Data and signal transfer: even if the data is minimal, the channel acts as a signal of readiness or completion of an operation.

Thus, a channel is not just a data transport but a mechanism for coordination and synchronization between execution threads.