Abstract: The Cherenkov Telescope Array Observatory (CTAO) will be the next-generation gamma-ray observatory, investigating gamma-ray and cosmic ray astrophysics at energies from 20 GeV to more than 300 TeV. The observatory, consisting of large arrays of imaging atmospheric Cherenkov telescopes in both the southern and northern hemispheres, will achieve a sensitivity improved by up to an order of magnitude compared to exisng instruments. CTAO is expected to discover hundreds of new TeV gamma- ray sources, allowing it to significantly advance our understanding of highly non-thermal sources, to probe larger distances in the universe, and to search for dark mater with unprecedented sensivity in the TeV mass range. This talk will discuss the scienfic movaon for CTAO, its design, and its expected capabilies. The current status of CTAO, including telescope development, sites, and future steps, will be reviewed.