Can you explain what channels are in the implementation of push notifications?

In the context of push notifications on Android, a channel is a category of notifications that allows grouping and customizing notification behavior for the user.

Each channel has its own settings: sound, vibration, priority, lock screen display, etc. The user can manage these settings for each channel separately.

For example, an app can create separate channels for news, messages, and advertisements, so the user can mute the sound for ads but keep it for messages.

Example of creating a channel in Kotlin:

val channel = NotificationChannel(
    "news_channel",
    "News",
    NotificationManager.IMPORTANCE_DEFAULT
)
notificationManager.createNotificationChannel(channel)