Stream editing is a technique used to process and manipulate data streams in real-time. It allows users to apply various transformations, such as filtering, sorting, or modifying data as it flows through a system. This is particularly useful in scenarios where immediate feedback or action is required, such as in data analysis or network monitoring. One popular tool for stream editing is sed, a command-line utility in Unix and Linux environments. It enables users to perform basic text transformations on an input stream, making it easier to automate tasks and handle large volumes of data efficiently.