CATV (Community Antenna Television) networks were developed several decades ago to deliver a few channels of analog television to a fraction of the homes in a small area. Over the intervening years, these networks have evolved into true communications networks supporting digital video and the delivery of different targeted services to homes and business covering a much larger area. Supporting targeted services and spanning the longer distances has required the application of several technologies and the development of new network architectures. These new services require the use of technologies such as WDM. First, the unique characteristics of CATV networks are discussed. Examples of WDM-based network architectures that can support targeted data services via CATV cable modems and Video-on-Demand (VOD) are also presented.