To block someone on WhatsApp, you can follow these straightforward steps depending on your device and preference:

Blocking via Chat

1. Open WhatsApp and go to the chat with the person you want to block.
2. Tap the contact's name at the top of the chat to open their profile.
3. Scroll down and tap Block.
4. Confirm by tapping Block again.

This will stop the contact from sending you messages, calling you, or seeing your status updates

Blocking via Settings

For Android:

1. Open WhatsApp.
2. Tap the three vertical dots in the top right corner.
3. Select Settings > Account > Privacy > Blocked contacts.
4. Tap the Add icon (usually a plus sign) in the top right corner.
5. Select the contact you want to block.

For iOS:

1. Open WhatsApp.
2. Tap Settings in the bottom right.
3. Go to Account > Privacy > Blocked.
4. Tap Add New and select the contact to block

Additional Notes

• Blocking someone does not delete the chat, but you can delete or archive it if you wish.
• You cannot block entire groups, but you can exit groups and block the group admin.
• If you want to unblock someone later, you can do so from the same privacy settings.
• You can also block unknown numbers directly from the chat or notification if you receive a message from them

Blocking someone effectively prevents them from contacting you on WhatsApp without notifying them explicitly.