In reading comprehension, what does the term "main idea" refer to?

The term "main idea" refers to the central point or concept of a passage. It encapsulates what the text is primarily about and serves as the overarching theme that unifies the various details and arguments presented throughout the piece. Identifying the main idea is essential for comprehension, as it helps readers understand the author's intent and the text's significance.

In contrast, other options delve into different aspects of a text. The conclusion drawn from the text pertains more to the reader’s interpretation or understanding after engaging with the content rather than the primary focus itself. Supplementary details may provide additional context or examples but do not represent the core message. An author's personal opinion can inform the text but does not define the main idea unless it is integral to the overall argument being made.