DTD
DTD or Document Type Definition acts as a manual for constructing web pages. It helps web designers with a layout to arrange web pages in a systematic manner. This plays a crucial role in improving a website’s appearance across various web browsers.
DTD helps to rectify any mistakes in the data in an XML document. DTD provides a standardised structure to the XML document, thereby ensuring operability across different systems and applications. DTD provides a description of each XML document and thus, helps the users form an understanding of what each piece of data is about.