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Every time a new version of an application is released, or when someone makes a change to the source code that goes into Ubuntu, the source package must be uploaded to Launchpad's build machines to be compiled. The resulting binary packages then are distributed to the archive and its mirrors in different countries. The URLs in ``/etc/apt/sources.list`` point to an archive or mirror. Every day images are built for a selection of different Ubuntu flavours. They can be used in various circumstances. There are images you can put on a USB key, you can burn them on DVDs, you can use netboot images and there are images suitable for your phone and tablet. Ubuntu Desktop, Ubuntu Server, Kubuntu and others specify a list of required packages that get on the image. These images are then used for installation tests and provide the feedback for further release planning.