Every website is coded using a certain language and techniques to generate the wanted effect on the design of the site. The code of the website is what the search engines see when crawling your website rather than viewing the front end design that we see as users. It is essential that this code is build to meet coding standards to make it as easy as possible for search engines to crawl.
If there are errors within the code then search engines will have to skip that part of the code as they will be unable to read it. This can seriously effect the SEO results for your website as search engines like Google need to be able to read the whole thing in order to rank your site effectively in their database. If there are errors they may miss essential parts of your content that would improve ranking results.
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