This chapter explores detailed consideration and examples of thin films and coatings based on case studies and examples of their usage in engineering fields. This way, the chapter aims to illustrate the capacity and potential application of advanced materials when dealing with sophisticated engineering problems. The case studies range from using nanoparticles to boost the performance of an electronic device to using nano-enhanced concrete, designing better building materials, and increasing the effectiveness of working renewable energy systems among others. Therefore, this chapter builds up the arguments about how thin film and coating technologies are being enforced to set newer fronts in performance, sustainability, and cost-effectiveness in diverse sectors.