Convert xhtm to pnm

What is the difference between .xhtm and .pnm?

Description: The Extensible Hypertext Markup Language (XHTML) file type is an XML-based markup language for creating web pages. It is a hybrid of HTML and XML and is designed to replace HTML as the main language for creating web content. XHTML files provide a more flexible, extensible structure for web documents, allowing for more complex page designs and better integration with other web technologies.; The PNM (Portable Any Map Image) file format is a subset of the broader Netpbm format, designed for storing various types of digital images. It acts as an umbrella term for three specific types of grayscale, color, and black-and-white images, represented by PBM (Portable Bitmap), PGM (Portable Graymap), and PPM (Portable Pixmap) formats respectively. PNM files are known for their simplicity and ease of conversion to other image formats.