The document discusses semiotics, the study of signs and symbols as elements of communication, and its foundational theories proposed by key figures like Ferdinand de Saussure and Charles Peirce. It outlines various branches and applications of semiotics, including semantics, pragmatics, and their relevance in mass communication, marketing, and cultural analysis. Additionally, it highlights the impact of semiotics in fields such as religion, theater, and architecture, emphasizing the significance of understanding meaning-making processes in different contexts.