Guest editors of IEEE Transactions on Software Engineering journal introduced a special section on Software Language Engineering (SLE). They explained the relevance of the relationships between the three words, Software, Language, and Engineering before describing the technical aspects of Software Language Engineering and demonstrating some of them through the technical papers presented in the special section. They explained that languages need not be represented explicitly and precisely to be successful despite explicit language descriptions being one of the characteristics of software language engineering. They informed that the term Software Language (SL) was used to refer collectively to all kinds of languages involved in software production. It was also essential for software engineers to consider each software language as a single entity with two aspect to initiate SLE.