This document discusses language contact and multilingualism. When languages come into contact, there can be language shift, where speakers adopt a majority language, or language maintenance, where minority languages are continued. Factors like status, territorial distribution, and institutional support influence whether languages are maintained. In multilingual settings, contact languages emerge and languages can converge through shared vocabulary. Code switching and multilingual discourse also occur when speakers mix linguistic elements. Language attitudes are shaped by ideologies like monoglossicism and pluralism. Diglossia describes separate high and low varieties used in different social contexts. Accommodation and audience design influence how speakers adapt their language based on their audience.