Passing information, emotions and thoughts between two or more people.

Issuing commands, requests, or instructions (e.g., 'Serve the tea.').

Showing or expressing personal feelings, emotions, and attitudes (e.g., 'I'm so sad today!').

Language can be used to discuss or analyze itself (e.g., 'What does the word book mean?').

Social interaction or maintaining relationships, not just passing messages. (e.g., 'How do you do ?').

Provides factual information about the world (e.g., 'The sun rises in the East and sets in the West').

This is the aesthetic or artistic use of language in poetry, literature and slogans.