The central idea in an informational text is best defined as the big idea or main point the author wants readers to understand about the topic. It is developed through key details in the text and provides insight into the overall message. Contrary to simply stating the topic, the central idea reflects the specific perspective or argument the author is conveying. For example, a central idea could be about the systematic persecution of Jews in Nazi Germany, highlighting different aspects such as policies, discrimination, and violence.
In summary, the central idea goes beyond the main topic and requires the integration of supporting details to form a comprehensive understanding of the author's main point.