ICQ is possibly one of the programs responsible for creating the need for direct and real-time communication from connected contacts. Its complexity made it lose the first place, but after that loss, the program took a turn in terms of interface and manageability, re-establishing itself in the first positions.
Over the years, this tool has continued to evolve to try to adapt to new times. Among its main characteristics, ICQ allows us to send SMS, chat with our contacts, have voice conversations, videoconferences, have talks with other users with our same interests, …
Without a doubt, ICQ is still a great real-time chat program spiced up with some pretty cool extras.