Cnn
In short
An American multinational news media company that operates the first 24-hour television news channel in the United States. It is a flagship property of CNN Worldwide, a division of Skydance Corporation.
In plain words
It is a television network that broadcasts news all day and all night. Instead of just showing news at specific times, it provides constant updates on world events.
A simple example
If a major event happens in London at midnight, CNN reporters will broadcast live coverage immediately rather than waiting for the morning news programme.
Why it matters
It changed how the world receives information by making news a constant, real-time service. This helped create the modern era of instant global reporting.
Easy to mix up
Do not confuse it with the Canadian news network CBC or the news division of a different corporation.