This document discusses different language functions and text types. It outlines six main functions: expressive, informative, vocative, aesthetic, phatic, and metalingual. The expressive function focuses on expressing feelings or opinions. The informative function aims to convey factual information about a topic. The vocative function addresses a readership and must be immediately comprehensible. The aesthetic function uses language to please the senses through sound and metaphor. It also defines key terms related to different language functions like onomatopoeia, alliteration, rhyme and meter.