Construction of Realistic superstring Standard-like Models.

I discuss the construction of realistic superstring standard–like models in the four dimensional free fermionic formulation. I discuss proton lifetime constraints on superstring models. I discuss the massless spectrum of the superstring standard–like models, the texture of fermion mass matrices in these models and argue that the realistic features of these models are due to the underlying Z2 × Z2 orbifold compactification.