Nepedia
Back to Discover
Advanced Reader
💻

Instant messaging

technology Maturity 5-7 Next article →

Instant messaging, often called IM, is a type of synchronous computer-mediated communication. This means it allows for the immediate, or real-time, transmission of messages between two or more people over the Internet. Unlike email, which is not real-time, IM allows for the immediate receipt of a reply or an acknowledgment.

Gossip-chat
Gossip-chat

This technology connects specific known users through a contact list, often called a "buddy list" or "friend list." Users can also communicate in chat rooms. Today, IM is integrated into social media platforms and even used for conversational commerce on websites.

To understand how these messages move, we must look at the technical architecture. There are two primary models: peer-to-peer and client-server. In a peer-to-peer model, the transmission is a direct point-to-point connection between users.

Instant messengers protocols
Instant messengers protocols

However, most primary IM services use the client-server model. In this system, all clients must first connect to a central server managed by the platform operator. There is also a serverless model, which does not require central servers at all. Examples of serverless messengers include Tox, Ricochet, and Bitmessage.

Modern IM services have evolved far beyond simple text. While early networks were limited to text, today's applications feature a wide array of multimedia tools. Users can engage in VoIP, which stands for Voice over Internet Protocol, to make voice calls using a microphone. They can also use videotelephony, which uses a webcam to allow for video chat. Other common features include file transfers, location sharing, and the exchange of images, videos, and voice notes. Some apps even allow for peer-to-peer payments, letting users complete financial tasks within the chat interface.

Pidgin screenshot
Pidgin screenshot

The history of instant messaging began long before the modern Internet. The first instances appeared in the mid-1960s on multi-user operating systems like CTSS and Multics. Initially, these systems were used as notification services for things like printing. In 1973, the Talkomatic program on the PLATO system allowed five people to chat simultaneously.

PLATO-Talkomatic
PLATO-Talkomatic

During the 1980s, Bulletin Board Systems (BBS) like Freelancin' Roundtable offered similar chat features. In 1980, Alexander "Sandy" Trevor created the CompuServe CB Simulator, which was a general-availability commercial online chat service.

As networking technology improved, new protocols emerged. The Internet Relay Chat (IRC) protocol began development in 1989 and became the first widespread standard for the Internet. In the 1990s, graphical messengers like ICQ and AOL Instant Messenger (AIM) became popular. ICQ was among the first closed and commercialized messengers, and its authors eventually sold it to AOL. In 1998, IBM introduced Lotus Sametime, which was the first popular example of enterprise-grade instant messaging for businesses. In 2000, the Extensible Messaging and Presence Protocol (XMPP) was launched to provide an open standard.

Online N'ko classroom via WhatsApp (cropped)
Online N'ko classroom via WhatsApp (cropped)

The scale of instant messaging today is massive. In 2018, WhatsApp was the largest network with 1.3 billion monthly users. WeChat followed with 980 million monthly active users. The popularity of specific apps often depends on the country and the intended use. For example, Skype focuses on video calling, while Slack is designed for work teams to share files. Snapchat focuses on image messages, and Discord features built-in games within its voice channels.

Instant messaging is deeply connected to many other digital systems. It serves as a core component of social networking services like Facebook Messenger, Instagram, and TikTok. It is also used on dating websites such as OkCupid and within online gaming platforms. Some applications even integrate entertainment, such as Facebook Messenger's ability to play games like Tetris or Blackjack.

Facebook chat screenshot (English)
Facebook chat screenshot (English)

Whether used for professional work, social connection, or commerce, IM remains one of the most widely used smartphone technologies in the world.

615 words

Where will your curiosity go next?

Keep exploring at your chosen reading level.

🖼️ Images & Media (10)
File:Gossip-chat.png
Gossip-chat.png
File:Online N'ko classroom via WhatsApp (cropped).jpg
Online N'ko classroom via WhatsApp (cropped).jpg
File:Instant messengers protocols.svg
Instant messengers protocols.svg
File:Pidgin screenshot.png
Pidgin screenshot.png
File:PLATO-Talkomatic.png
PLATO-Talkomatic.png
File:Unix talk screenshot 01.png
Unix talk screenshot 01.png
Element 1.12.7 screenshot.webp
File:Facebook chat screenshot (English).png
Facebook chat screenshot (English).png
File:Pidgin Screenshot Ubuntu.png
Pidgin Screenshot Ubuntu.png
File:LolTextMessage.jpg
LolTextMessage.jpg
More to explore

🔬 Go deeper

More advanced topics to explore

🪜 Step back

Simpler topics to build understanding

What is Nepedia?

A free, ad-free encyclopedia for children. Every article is written at five reading levels, so the same page works for a five-year-old and a fifteen-year-old — use the level switcher above to see this one change. No account needed to read.