Jing is a free cross-platform screen recording application that allows users to take screenshots and record short videos, known as screencasts, of their computer screen. These screencasts can then be instantly shared over the web or via email. The document discusses how teachers and students can use Jing for educational purposes such as creating tutorials, demonstrating processes, and having students record themselves solving problems or sharing findings. Some benefits of Jing include its ease of use, compatibility with PCs and Macs, and sharing features, though it has limitations such as a 5 minute recording limit.