A low-energy determination of ${\alpha }_s$ at three loops

We review one of the most accurate low-energy determinations of ${\alpha }_s$. Comparing at short distances the QCD static energy at three loops and resummation of the next-to-next-to leading logarithms with its determination in 2+1-flavor lattice QCD, we obtain $\alpha_s(1.5~{\rm GeV})=0.336^{+0.012}{-0.008}$,whichcorrespondsto$\alpha_s(M_Z)=0.1166^{+0.0012}{-0.0008}$. We discuss future perspectives.