  The formation of stars, particularly the high-mass star formation, poses
several still open questions. Nowadays, thanks to the most modern telescopes
and instruments, we are able to observe and analyse many physical and chemical
processes involved in the birth of massive stars. This work introduces to the
interstellar medium, cradle of the stars, and makes focus on the interstellar
structures distributed in the different spatial scales related to the collapse
of the gas that gives rise to the star formation processes. Through some
current works done by the investigation group of Interstellar Medium, Star
Formation and Astrochemistry belonging to Instituto de Astronom\'ia y F\'isica
del Espacio (https://interestelariafe.wixsite.com/mediointerestelar), it is
shown that the observational study of the star formation is a research that
must be carried out in a multispectral way, pointing to the spatial multiscale.
