  This is a review of the theoretical aspects of the supersymmetric extension
of the Standard Model of particle physics, extracted from Chapter 88 of the
2023 update of the Review of Particle Physics, which appears in R.L. Workman et
al. (Particle Data Group), Prog. Theor. Exp. Phys. 2022, 083C01 (2022) and 2023
update. The companion review, "Supersymmetry, Part II (Experiment)", can be
found in Chapter 89 of the Review of Particle Physics (op. cit.).
