The chapter reviews the electronic properties of bilayer graphene, starting with a description of the tight-binding model and the derivation of the effective Hamiltonian that describes massive chiral quasiparticles in two parabolic bands at low energy. The tight-binding model accounts for five parameters of the Slonczewski-Weiss-McClure model of bulk graphite and intra- and interlayer asymmetry between atomic sites, which induce band gaps in the low-energy spectrum. The Hartree model of screening and band-gap opening due to interlayer asymmetry in the presence of external gates is presented. The tight-binding model is used to describe optical and transport properties, including the integer quantum Hall effect, orbital magnetism, phonons, and the influence of strain on electronic properties. The chapter concludes with an overview of electronic interaction effects.The chapter reviews the electronic properties of bilayer graphene, starting with a description of the tight-binding model and the derivation of the effective Hamiltonian that describes massive chiral quasiparticles in two parabolic bands at low energy. The tight-binding model accounts for five parameters of the Slonczewski-Weiss-McClure model of bulk graphite and intra- and interlayer asymmetry between atomic sites, which induce band gaps in the low-energy spectrum. The Hartree model of screening and band-gap opening due to interlayer asymmetry in the presence of external gates is presented. The tight-binding model is used to describe optical and transport properties, including the integer quantum Hall effect, orbital magnetism, phonons, and the influence of strain on electronic properties. The chapter concludes with an overview of electronic interaction effects.