Teacher (also called a school teacher or, in some contexts, an educator) is a person who helps others to acquire knowledge, competences or values.
For example, the teacher might explain the compressibility of air in a bicycle pump by describing it as dispersed particles which may be brought closer or else by comparing it with the behaviour of a spring.
In some countries, teaching young people of school age may be carried out in an informal setting, such as within the family (homeschooling), rather than in a formal setting such as a school or college.
Some other professions may involve a significant amount of teaching (e.g. youth worker, pastor)
Teachers working with Key Stage pupils might, for instance, focus on the subject content of science and develop science skills from these areas of experience. This product centred approach could, for example, give rise to oral explanations and demonstrations of scientific knowledge, and, from time to time, practical activities designed to provide direct experience of phenomena with opportunities to explore and investigate these phenomena.
Informally the role of teacher may be taken on by anyone (e.g. when showing a colleague how to perform a specific task).
In providing a conceptual structure to help the learner build a functional mental representation, the teacher highlights what is relevant and the nature of the relationships between the elements.
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