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The "ATOMS," standing for {\it ALMA Three-millimeter Observations of MassiveStar-forming regions}, survey has observed 146 active star forming regions withALMA Band 3, aiming to systematically investigate the spatial distribution ofvarious dense gas tracers in a large sample of Galactic massive clumps, tostudy the roles of stellar feedback in star formation, and to characterizefilamentary structures inside massive clumps. In this work, the observations,data analysis, and example science of the "ATOMS" survey are presented, using acase study for the G9.62+0.19 complex. Toward this source, some transitions,commonly assumed to trace dense gas, including CS $J = 2-1$, HCO$^+$ $J = 1-0$and HCN $J = 1-0$, are found to show extended gas emission in low densityregions within the clump; less than 25\% of their emission is from dense cores.SO, CH$_3$OH, H$^{13}$CN and HC$_3$N show similar morphologies in their spatialdistributions and reveal well the dense cores. Widespread narrow SiO emissionis present (over $\sim$1 pc), which may be caused by slow shocks fromlarge--scale colliding flows or H{\sc ii} regions. Stellar feedback from anexpanding H{\sc ii} region has greatly reshaped the natal clump, significantlychanged the spatial distribution of gas, and may also account for thesequential high-mass star formation in the G9.62+0.19 complex. The ATOMS surveydata can be jointly analyzed with other survey data, e.g., "MALT90", "Orion B","EMPIRE", "ALMA\_IMF", and "ALMAGAL", to deepen our understandings of "densegas" star formation scaling relations and massive proto-cluster formation.

ATOMS: ALMA Three-millimeter Observations of Massive Star-forming regions -- I. Survey description and a first look at G9.62+0.19