What is the instrumental function of language as theorized by Halliday?

The instrumental function of language, as theorized by Halliday, refers specifically to the use of language to fulfill practical needs and desires. This includes aspects such as requesting food, expressing the need for comfort, or communicating issues related to security. This function highlights how language serves as a tool for achieving concrete goals in everyday life, reflecting a child's basic requirements in their environment.

In contrast, expressing emotions is centered around conveying feelings rather than practical needs; describing experiences relates more to sharing observations or thoughts than fulfilling basic requirements; and engaging in storytelling focuses on imaginative and narrative aspects of communication rather than addressing immediate needs. Each of these illustrates different functions of language, but none align as closely with the instrumental function as the fulfillment of basic needs does.