In every situation where value is created there is a stream of activities, also known as the value stream. By deliberately analyzing the details of this stream, you can make its sequence visible and then improve it. Particularly in software delivery, this clear view is often missing. It proves its value, for example, when you are trying to break down silo thinking. Visualizing work from other silos helps to create greater empathy. Here we explain the basic principles of a value stream, a value stream network, and value stream mapping.