  CarbON CII line in post-rEionization and ReionizaTiOn (CONCERTO) is a
low-resolution spectrometer with an instantaneous field-of-view of 18.6 arcmin,
operating in the 130-310 GHz transparent atmospheric window. It is installed on
the 12-meter Atacama Pathfinder Experiment (APEX) telescope at 5100 m above sea
level. The Fourier transform spectrometer (FTS) contains two focal planes
hosting a total of 4304 kinetic inductance detectors. The FTS interferometric
pattern is recorded on the fly while continuously scanning the sky. One of the
goals of CONCERTO is to characterize the large-scale structure of the Universe
by observing the integrated emission from unresolved galaxies. This methodology
is an innovative technique and is called line intensity mapping. In this paper,
we describe the CONCERTO instrument, the effect of the vibration of the FTS
beamsplitter, and the status of the CONCERTO main survey.
