"Protostars and protoplanetary disks with JWST: probing the material that builds planets"

Understanding how stars and planets are formed requires observations at long wavelengths in order to penetrate their dusty natal clouds. Thanks to its high sensitivity and resolution, Webb is a major step
forward in studying the physical and chemical structure of embedded protostars and disks. This talk will present an overview of recent results from a number of JWST programs on gaseous and icy molecules, from water to a variety of organic species. Together with related ALMA data, they point to a rich chemistry with a varying composition and C/O ratio that may be linked to stellar mass and to the physical structure of the planet-forming zones of disks.