The STELLA Robotic Observatory (abbreviation for STELLar Activity) is a long-term project for observing and monitoring activity tracers on cool stars with two robotic telescopes: STELLA-I equipped with a high resolution echelle spectrograph, a large-format CCD imager and photometer, and STELLA-II also equipped with an optical CCD imager and photometer. After listing the most important technical details we focus on some of the scientific programs planned for routine observations of active stars by STELLA.