What is the theory of multilingualism in linguistics?

The theory of multilingualism in linguistics examines the fundamental properties, the use and interaction of multiple languages within an individual or communities. It encompasses the study of how people acquire, maintain, and use multiple languages in various contexts. This theory explores the cognitive, social, and cultural aspects of multilingualism, recognizing the dynamic nature of language practices in diverse linguistic environments. Researchers in this field aim to understand the complexities of language contact, bilingualism, and multilingual communication.