Why people are talking to themselves?

EN: People are talking to themselves either to master oral communication skills or in favor of using open and widely acceptable communication protocol (as opposed to proprietary one).

RU: Liudi razgovarivayut sami s soboi libo dlya trenirovki razgovornih navikov libo ot izlishney liubvi k otkritim sovmestimim prototokolam (v protivopolozhnost’ k chastnim zakritim).