Multilingualism is the use of two or more languages, either by an individual speaker or by a community of speakers. Multilingual speakers outnumber monolingual speakers in the world's population.

Multilingualism is becoming a social phenomenon governed by the needs of globalization and cultural openness.

Owing to the ease of access to information facilitated by the Internet, individuals' exposure to multiple languages is becoming increasingly frequent, thereby promoting a need to acquire additional languages. People who speak several languages are also called polyglots.

Aphasia in multilingual individuals: the importance of bedside premorbid language proficiency assessment ¹⁾.