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WeChat, known as Weixin in China, is a massive mobile application. It functions as an instant messenger, a social media platform, and a mobile payment system. Because it performs so many different tasks, experts often call it a "super-app."

The app was developed by the company Tencent. In 2018, it became the largest standalone mobile app in the world. At that time, it had over 1 billion monthly active users. By January 2022, reports indicated the user base had grown to more than 1.2 billion people.

The app offers many ways to communicate and share information. Users can send text messages, hold-to-talk voice messages, and broadcast messages to many people at once. It also supports video conferencing and video calls.

People can share photographs, videos, and their GPS locations. One clever feature uses a distance-sensing mechanism. When a user brings the phone close to their ear, the app activates the hold-to-talk function. When the phone is moved away, the speakers automatically disable. This prevents voice messages from being broadcast to the public by mistake.

WeChat includes several distinct social features, such as "Moments" and "Public Accounts." Moments is a social feed where users post updates, images, and short videos for their friends.

Privacy is managed through contact groups. Friends can only see comments or likes if they belong to the same mutual friend group. Public Accounts allow individuals or organizations to push content to subscribers. These accounts can provide services like hospital pre-registrations or credit card management. By the end of 2014, there were 8 million official accounts on the platform.

The history of WeChat began with a shift in technology. By 2010, Tencent already owned a large desktop messenger called QQ. CEO Pony Ma realized that smartphones would soon change how people communicate. In October 2010, a project started at the Tencent Guangzhou Research and Project center.

An engineer named Allen Zhang created the original version. Pony Ma named it "Weixin." The app launched in 2011, but initial growth was slow. Everything changed in May 2011 when the developers added the walkie-talkie-style voice messaging feature. By 2012, the app reached 100 million users, and President Martin Lau rebranded it "WeChat" for international markets.

WeChat Pay, or Weixin Pay, is a vital part of the app's ecosystem. It is a digital wallet service that allows users to pay bills, order goods, and transfer money.

Users can link bank accounts or credit cards to the app. A major turning point occurred during the 2014 Chinese New Year. WeChat introduced virtual "red envelopes" for sending money to friends. This feature led to a "Red Envelope War" with competitors like Alibaba's Alipay. In 2014, 16 million red envelopes were sent, and that number rose to 1 billion the following year.

There are significant differences between the Weixin and WeChat versions. Accounts registered with Chinese phone numbers use the Weixin brand.

The data for these users is stored in mainland China. The Weixin software license agreement forbids content that endangers national security or undermines national unity. User activity on Weixin is also subject to tracking by Chinese authorities. In contrast, the WeChat version is used by people with non-Chinese numbers. These users follow a more liberal terms of service. Their data is stored in the Netherlands for those in the European Union, or in Singapore for others.

WeChat's impact on the digital economy is measurable through its massive revenue. In 2017, the app earned about US$0.9 billion from social media advertising. However, its revenue from value-added services was much higher at US$5.5 billion.

By 2018, WeChat was used by 93.5% of all internet users in China. The app has also faced political challenges in other countries. In June 2020, India banned WeChat due to a border dispute with China. In the United States, there were attempts to ban transactions with the app, though these efforts were later dropped.

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