Language Revitalization:The process of restoring and reinvigorating a language that is in danger of becoming extinct or falling out of active use, often through educational programs, community efforts, and policy changes.
Language Shift:The gradual process by which a speech community shifts from using one language or language variety to using another, often due to social, economic, or political factors.
Language Endangerment: The state of a language that is at risk of falling out of use, either because its speakers are dwindling in number or because it is losing ground to a more dominant language within a community.