WhatsApp is a cross-platform mobile messaging app. It is enriched with several emojis. One of them allows you to send a beating heart to your friends to show them how much you love them.
Steps

Step 1. Open the WhatsApp app on your Android phone
The app icon looks like a green bubble around a white phone handset.
If you haven't installed it yet, click here to find out how to do it and how to create a new account

Step 2. Press the DISC icon
If the application opens on a page other than the DISC page, press the button DISC in the navigation bar at the top left of your screen. This will allow you to open a list of your recent private and group chats.

Step 3. Tap a chat
Tap the chat you want to send the beating heart emoji to. Thus, it will open in full screen. Note that this discussion can be private or can be a group.

Step 4. Tap the emoji icon
This button looks like a smiley face and is located at the bottom left of the input field. Tapping on it will bring up the emoji menu.

Step 5. Tap the icon
?#. The emoji menu is subdivided into different categories of tabs on Android devices. You will see the button !?# in the second category by counting from the right at the top of the emoji menu.
You can also drag the menu to the left to move from one category to another

Step 6. Tap the red heart emoji
It is the first in the series and is located at the top left of the!? # Tab.
Do not add any other emoji or text to your message. This will cancel the heart animation (beating) and send the emoji of an un-animated still heart

Step 7. Send your message with the send button
This button looks like a paper airplane icon and is located on the right side of the text box. Tap it to send the message (which is the beating red heart emoji) to your recipient.