The video demonstrates the process of converting single-line text to multiline text (Mtext) & multiline text (Mtext) to single-line text in AutoCAD, likely showcasing the steps and tools involved in making this transition within the software. To change single-line text to Mtext in AutoCAD, select the single-line text, right-click, and choose "Convert to Mtext" from the context menu. Alternatively, you can use the "TXT2MTXT" command and follow the prompts to convert single-line text to Mtext. To