Since 2008, the series of scientific monographs "Aspects of Language and Communication" continues under the new title of the publication series "Theoretical and Applied Linguistics," published in 1999-2002. Issue 5 "Paradoxes of the border in language and communication" unites a number of works published in 1978-2010. V. B. Kashkin on comparative linguistics, functional typology, the theory of intercultural communication and everyday metalinguistics. The text of the works has been updated, supplemented and presented in the form of a single monograph. The publication is designed for specialists in the field of linguistics, communication theory, translation and language teaching, for students and graduate students of philological and related specialties.