The document discusses bilingualism and multilingualism. It defines bilingualism as the ability to use two languages effectively. There are different types of bilingualism such as additive, subtractive, and receptive bilingualism. Multilingualism is defined as the ability to communicate in three or more languages, which can occur for individuals or societies. Some benefits of bilingualism and multilingualism include increased career opportunities, improved cognitive functions, and a more well-rounded worldview.