The Taishan Antineutrino Observatory (TAO) is a satellite experiment of JUNO. It features a ton-level liquid scintillator detector, which operated at $-$50$\,^\circ$C and located 44 m from a reactor core of the Taishan Nuclear Power Plant. It detects reactor antineutrinos via the process of inverse beta decay (IBD). To collect photoelectrons, Silicon photomultipliers (SiPM) that provide nearly 95% coverage and approximately 50% photon detection efficiency are employed, achieving a light yield of around 4500 photoelectrons per MeV. The dark noise of SiPMs is suppressed by several orders of magnitude through cooling the detector to $-$50$\,^\circ$C. The main goal of TAO is to precisely measure the energy spectrum of reactor antineutrinos with a high energy resolution of less than 2% at 1 MeV. It will deliver a reference energy spectrum for JUNO, helping to reduce the uncertainties from the reactor antineutrino flux and spectrum model, and providing a benchmark for nuclear databases. Furthermore, TAO will also search for light sterile neutrinos with a mass scale around 1 eV and contribute to validating technologies for reactor monitoring and safeguards. This talk outlines the preliminary results of TAO 1:1 prototype and presents the latest status of final TAO detector.