What is W3c Validator?

What is W3c Validator?
The W3c validator performs the key function of ensuring the technical quality of web pages by verifying that your website conforms to the code, or more specifically, follows the correct formatting standards presented by World Wide Web standards.
If the list of errors is extensive, such as poor readability or coding errors that can directly affect the traffic of your website, then the W3c validator will ensure that your website is not affected and meets the necessary standards.