Validating data in Microsoft Access allows you to check data whilst it is being entered by the database user and will enable you to not save the data if it breaks any validation rules or routines.
It is easy for an end user to make a mistake when they are entering data or even to leave out important details that must be entered, so we need to check this data when it is being entered into the database.
While many veterans have learned to create error-free code and make relatively few validation errors, most beginners make more errors.
Validates HTML files for compliance against the W3C standards and performs linting to assess code quality against best practices.
If you fail to validate the pages of your website based on W3C standards, your website will most likely suffer from errors or poor traffic owing to poor formatting and readability.1. W3C validation helps you to get better rankings in search engines.
Errors in your code can affect your sites performance and also make a big impact on you sites SEO, search engines check the HTML or XHTML code of your website when searching.
It also teaches and encourages best practices for web design.It only ensures that your code is free of syntax errors.As Roger Johannson writes: Note that "works in any web browser" does not mean "looks the same in every web browser." Making a document look identical across browsers and platforms is next to impossible.Markup validation is an important step towards ensuring the technical quality of web pages.W3C validation is the process of checking a websites code to determine if it follows the formatting standards.