A brief review of the early development efforts in lead salt detectors is presented. Applications and methods of fabrication of contemporary devices are also discussed. State-of-the-art detectors are characterized for their chemical, structural, and photoelectronic properties. Performance characteristics as a function of operation temperature, frequency, background energy levels, etc., are described. Radiation effects are briefly discussed. A short summary of the mechanics of photoconductivity of the lead salt films is presented. Multi-element array designs and performance characteristics of typical current operational hardware are reviewed. Design and operational limitations are identified. Advanced concepts of Integrated (Hybrid and Monolithic) Detector Arrays are also reviewed.