By enabling Instant Messaging controls, you can block or allow specific users on your preferred Instant Messaging applications. You can also set specific keywords (profanities or undesirable content) that will be block messages containing these words. More importantly you can communicate over instant messaging without your conversation being vulnerable to others viewing it.
With this feature enabled, you can comfortably allow your children to use instant messaging to speak with their friends and your family and prevent them from messaging with specific users or unknown users.