The document discusses semantic barriers in communication. Semantic barriers refer to misunderstandings that arise due to different interpretations of words or symbols between the sender and receiver. These barriers can occur when messages are not expressed simply or contain ambiguous words, faulty translations, unclear assumptions, or technical jargon. Specifically, the document outlines different types of semantic barriers including denotative barriers from different word definitions and connotative barriers from different implied meanings depending on context. Homophones, homonyms, and homographs are provided as examples of linguistic structures that can cause semantic barriers.