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HTML validation is the process of checking the code against the formal guidelines and standards set by the Wide Web Consortium (W3C) for HTML/XHTML Web pages.
As a beginner, it is very common that you will make mistake in writing your HTML code. Incorrect or non-standard code may cause unexpected results in how your page displayed or functions in a web browser.
The World Wide Web Consortium (W3C) has created great tools https://validator.w3.org/ to automatically check your pages, and point out any problems/errors your code might have, such as missing closing tags or missing quotes around attributes.
Validating a website is the process of ensuring that the pages on the website conform to the norms or standards defined by the World Wide Web Consortium (W3C).
There are several specific reasons for validating a website, some of them are:
Follow the link given below to validate your HTML/XHTML document. It will automatically detect whether you're using HTML or XHTML, and which doctype you're using.