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identifies the topic of the text/tells what the text will be about.

divide the text into sections & explain what the sections will be about.

help the reader quickly search for information

show what something actually looks like (taken with a camera)

also show what something looks like, but they are drawn by artists.

explain what a photograph or illustration is about

shows what words are important or what words can be found in the glossary.

tells the definition of some of the words found in a text.

gives interesting facts or extra information about a topic.