Multilingualism has become an increasingly common global phenomenon especially in the last two decades. Therefore, multilingual programmes have now been regarded as a cornerstone of education systems in many countries around the world. Learning multiple languages helps us plug into a globalised world and strengthen links with a multitude of speakers from a diversified reality we live in. Thanks to the researched cases described in the chapters, further developments aimed at fostering multilingual practices in the contemporary world will be enhanced. The chapters included in the present volume, provide an overview of current theory, research and practice in the field. They deal with such prominent research topics as multilingual education, language policies, language contact, identity of multilingual speakers, to name only a few. The selected chapters focus on the numerous and heterogeneous relations between languages. They also incorporate a series of contextualized studies with divers