WhatsApp Great Feature. You can send a message to several of your friends at once (individually) through Broadcast list on WhatsApp

Creating a Broadcast List – Android Users

To create a Broadcast List:

1.            Open WhatsApp.

2.            Go to the Chats screen > Menu Button > New broadcast.

3.            Tap + or type in contact names to choose recipients from your contact list.

4.            Tap Done.

5.            Tap Create.