ICQ was also one of the first chat applications to allow users to customize their profiles and use emoticons in their messages. This feature was particularly useful for people who wanted to connect with others online but did not want to share personal information like their phone number or email address. Each user was assigned a unique identification number, which made it easy for users to add one another to their contact lists.

One of the features that set ICQ apart from other messaging apps was its unique identification number system.

The software also allows for voice and video calls, which was a significant innovation at the time of its release. Users can also see when their contacts are online and available to chat, and they can create group chats for multiple people to join. ICQ's interface is simple and user-friendly, allowing users to send and receive messages, files, and images quickly and easily. It was one of the first chat applications that allowed users to communicate with one another in real-time, and it quickly gained a large following. ICQ is a popular instant messaging software that was first introduced in 1996.

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