Lexicon of Online and Distance Learning, a desktop resource, focuses specifically on distance education for researchers and practitioners. It provides key information about all levels of education (that is, K–12, higher education, proprietary education, and corporate training), allowing for comprehensive coverage of the discipline of distance education. The book offers a comprehensive index of distance learning terms; cross-references to synonyms and, when appropriate, online web links to encourage further exploration. Each lexicon entry is categorized by its root terminology—general, education, technology, instructional technology, or distance education—and provides the actual definition and complete exploration of the term along with specific references that include related books, volumes, and available manuscripts.