Augmented reality (AR). It comprehensively covers AR's definition, history, hardware (including displays, tracking, and input devices), software and algorithms, development considerations (environmental/context, interaction, and visual design), diverse applications across various sectors (archaeology, architecture, education, manufacturing, commerce, healthcare, etc.), associated concerns (reality modifications and privacy), and legal implications regarding property rights. The article also profiles notable researchers in the field and includes a section on AR's portrayal in media. Finally, it lists related topics and sources.