This seminar report discusses augmented reality (AR) and its applications. AR combines real and virtual scenes by augmenting the real world with computer-generated perceptual information. The report describes Milgram's reality-virtuality continuum, compares AR and virtual reality, and discusses the hardware and software technologies used in AR like displays, sensors, image registration, and AR development platforms. It provides examples of AR applications in fields like archaeology, architecture, construction, and gaming. The report also outlines ways to experience AR and challenges like accuracy issues, information overload, and human perceptual problems.