Feedback from young stars, the molecular signature of shocks and outflows

Why do we study shocks ? Because they are there. Shocks ubiquitous in the interstellar medium (ISM), where constitute a major source of energy injection, together with photons and cosmic rays (CRs). Galactic shocks, converging flows at basis formation molecular clouds filaments, examples shocks. Shock waves also generated during birth, life death stars form jets protostellar outflows, stellar winds supernovae supernova remnants (SNRs). Hence, route feedback on galaxies. As such, proficient tool to better understand cycle matter galaxies, but stars. In this review, I will describe recent advances that can be observed characterized IRAM instruments, emphasis outflows.