  We present an overview of the CANDELS Lyman-a Emission At Reionization
(CLEAR) survey. CLEAR is a 130 orbit program of the Hubble Space Telescope
using the Wide Field Camera 3 (WFC3) IR G102 grism. CLEAR targets 12 pointings
divided between the GOODS-N and GOODS-S fields of the Cosmic Assembly Near-IR
Deep Extragalactic Legacy Survey (CANDELS). Combined with existing
spectroscopic data from other programs, the full CLEAR dataset includes
spectroscopic imaging of these fields over 0.8-1.7 um. In this Paper, we
describe the CLEAR survey, the survey strategy, the data acquisition,
reduction, processing, and science products and catalogs released alongside
this paper. The catalogs include emission line fluxes and redshifts derived
from the combination of the photometry and grism spectroscopy for 6048
galaxies, primarily ranging from 0.2 < z < 3. We also provide an overview of
CLEAR science goals and results. In conjunction with this Paper we provide
links to electronic versions of the data products, including 1D + 2D extracted
spectra and emission line maps.
