When you read a book, it's not just a long chunk of text, it is divided into chapters that contain related blocks of information. Each chapter will have a different topic (related or unrelated to the other chapters) but always related to the main topic of the book. In the same way, an HTML article/aside can have sections.
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section is basically a part of the document, that can contain intro, heading and other information. Basically a kind of wrapper
When you read a book, it's not just a long chunk of text, it is divided into chapters that contain related blocks of information. Each chapter will have a different topic (related or unrelated to the other chapters) but always related to the main topic of the book. In the same way, an HTML article/aside can have sections.