An accordion section is a list of headers which can be clicked to expand or collapse details. The details of the headers are all in text format, and the headers can be rearranged / re-ordered in the site editor.
Site collaborators can use this section to reveal or hide the details of the headers, as the site visitors click on the headers. Common use cases where accordion sections would work best are FAQs and glossaries.
In these examples, the headers can be the questions (for FAQs) or terms (for the glossary), while the details are the answers to the questions or the definition of the terms.