Planck was a CMB dedicated ESA mission that observed the microwave sky from 2009 to 2013, while the analysis of the data ended with the publication of a last set of articles in 2020. Its observation allowed us to measure the cosmic microwave background on the full sky to an unprecedented resolution and sensitivity. Those measurements translate into very strong constraints on the cosmological model and its parameters, which set the scene for the next generation of cosmological surveys. While the small scale polarization of the CMB, as well as the reconstruction of CMB lensing will be greatly improved by upcoming ground surveys, the Planck legacy will endure and remain a landmark in the field, as there is little improvement to expect in the future on the determination of the temperature anisotropies.
I will review the Planck Legacy and its main results in cosmology. I will describe the mission and its results. I will highlight how much it contributes to the strong constraint we can now apply to the cosmological model. Of course, when strongly reducing the parameter space of a model, there is always the chance of finding inconsistencies between the model prediction and the data. I will show how tiny this opportunity of breaking the model is today, and conclude by discussing the current tension found between the models preferred by different datasets.