Dailies are raw, unedited footage (usually synced to sound). They are called this because usually at the end of a shooting day, the film is processed so that the director and crew can view it right away. The idea behind this is to review their days work and look for mistakes or improvements that they can apply to later shots. Sometimes they will notice mistakes that will warrant a re-shoot. Dailies are also used to show studio executives so that they can keep up to date on the crew’s progress, and provide feedback if needed.