  We present an overview of the ALMA chemical survey of disk-outflow sources in
Taurus (ALMA-DOT), a campaign devoted to the characterization of the molecular
emission from partly embedded, young stars. The project aims at better
understanding the gaseous products that are delivered to planets by means of
high-resolution maps of assorted lines probing disks at the time of the planet
formation (less than 1 Myr). Nine different molecules are surveyed by our
observations of six Class I/flat-spectrum sources. A series of accompanying
articles analyze specific targets and molecules. Here we describe the sample
and provide a general overview of the results, focusing on the spatial
distribution, column densities, and abundance ratios of H$_2$CO, CS, and CN.
The results of this work are a first step toward the characterization of the
disk chemical evolution that need to be complemented by further observations of
less exceptional disks and customized thermo-chemical modeling.
