We propose a chapter devoted to the extensions of traditional database techniques toward the management of large sets of moving objects. The chapter will consist first of an introduction to new applications that require the manipulation of both spatial and temporal aspects of objects, along with detailed explanations on the new challenges raised by these applications under a database perspective. We shall then develop the presentation of some recent solutions to these challenges, while insisting on new, specific problems raised by the particular features of objects (e.g., query processing is strongly impacted by the need to manage continuous queries over objects whose position is intensively updated).