How do coroutines interact within a single program?

In Android (and Kotlin), interaction between coroutines is usually carried out through synchronization mechanisms and data exchange, such as:

• Channels — allow sending and receiving data between coroutines asynchronously.
• SharedFlow and StateFlow — reactive streams for propagating events and states.
• Shared context or objects with synchronization — for example, Mutex to protect shared resources.

An example of using a channel for message exchange between coroutines:

val channel = Channel<String>()

// Sender
launch {
    channel.send("Hello from coroutine")
}

// Receiver
launch {
    val message = channel.receive()
    println(message)
}

Thus, coroutines can exchange data and coordinate work without thread blocking.