This article provides a selective review on the recent literature on econometric models of network formation. The survey starts with a brief exposition on basic concepts and tools for the statistical description of networks. I then oﬀer a review of dyadic models, focussing on statistical models on pairs of nodes and describe several developments of interest to the econometrics literature. The article also presents a discussion of non-dyadic models where link formation might be inﬂuenced by the presence or absence of additional links, which themselves are subject to similar inﬂuences. This is related to the statistical literature on conditionally speciﬁed models and the econometrics of game theoretical models. I close with a (non-exhaustive) discussion of potential areas for further development.