What is Valid Code?
Most websites are written using mark up languages like html or PHP. It is important to have set standards so that different browsers can interpret the pages and then display then correctly. The w3.org was set up to manage and help verify these standards.
When web developers make websites to these standards it helps end users to be able to see the sites in the many different platforms (PC, laptop Mobile etc) as possible and as near to how they are meant to be seen.
Not all code can be validated. Some extras from websites, eg, the Facebook Like buttons, are often not written to high standards like w3c. However we can often implement valid code versions of these. As many CMS systems we use are valid code, when we make changes we try to make them as valid as possible. If there are just small difference then this wont usually render the website unviewable. So we aim to be fully valid for standard projects and for where we add stuff on we aim to be as valid as possible.
ONE important aspect to having valid code is the Search engines like it and it can boost your website in the search engines above your competitors and whose with badly written websites.
When we have valid code on your website then we can display the logos below with code so when it is clicked it goes to the correct tool and then shows that the code is valid.