"Body text" refers to the main content or written information in a document, article, or webpage. It includes paragraphs, sentences, and words that make up the core message, excluding titles, headings, and other formatting elements. Full definition
If you need to send your cover letter as the actual body text of your email, your approach will need to be slightly different. (cv-library.co.uk)
Use readable fonts for body text and headers and include some white space. (resume-now.com)
When designing page layouts, employ guides to establish specific boundaries for elements such as body text, titles, graphics, and navigation elements. (elearningindustry.com)