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We present the survey design, implementation, and outlook for COSMOS-Web, a255 hour treasury program conducted by the James Webb Space Telescope in itsfirst cycle of observations. COSMOS-Web is a contiguous 0.54 deg$^2$ NIRCamimaging survey in four filters (F115W, F150W, F277W, and F444W) that will reach5$\sigma$ point source depths ranging $\sim$27.5-28.2 magnitudes. In parallel,we will obtain 0.19 deg$^2$ of MIRI imaging in one filter (F770W) reaching5$\sigma$ point source depths of $\sim$25.3-26.0 magnitudes. COSMOS-Web willbuild on the rich heritage of multiwavelength observations and data productsavailable in the COSMOS field. The design of COSMOS-Web is motivated by threeprimary science goals: (1) to discover thousands of galaxies in the Epoch ofReionization ($6<z<11$) and map reionization's spatial distribution,environments, and drivers on scales sufficiently large to mitigate cosmicvariance, (2) to identify hundreds of rare quiescent galaxies at $z>4$ andplace constraints on the formation of the Universe's most massive galaxies($M_\star>10^{10}$\,M$_\odot$), and (3) directly measure the evolution of thestellar mass to halo mass relation using weak gravitational lensing out to$z\sim2.5$ and measure its variance with galaxies' star formation histories andmorphologies. In addition, we anticipate COSMOS-Web's legacy value to reach farbeyond these scientific goals, touching many other areas of astrophysics, suchas the identification of the first direct collapse black hole candidates,ultracool sub-dwarf stars in the Galactic halo, and possibly the identificationof $z>10$ pair-instability supernovae. In this paper we provide an overview ofthe survey's key measurements, specifications, goals, and prospects for newdiscovery.

COSMOS-Web: An Overview of the JWST Cosmic Origins Survey