  This article discusses the status of string physics where the string tension
is around the TeV scale. The article covers model building basics for
perturbative strings, based on D-brane configurations. The effective low energy
physics description of such string constructions is analyzed: how anomaly
cancellation is implemented, how fast proton decay is avoided and how D-brane
models lead to additional $Z'$ particles. This review also discusses direct
search bounds for strings at the TeV scale, as well as theoretical issues with
model building related to flavor physics and axions.
