When you block someone on WhatsApp, you no longer receive notifications, messages, calls, or status updates from them.
There's no direct way for someone you've blocked to know you've blocked them.
Of course, as with any app used for person-to-person interaction, sometimes it becomes necessary to block someone on WhatsApp.
What happens when you block someone on WhatsApp?
When you block someone on WhatsApp, you will stop receiving messages and calls from them.