How does Google determine relevancy? That is the billion-dollar question. Google uses highly advanced algorithms to determine what will be most relevant to your search. Google prefers to keep these things a secret to maintain a fairer and balanced system. However, online marketing experts have studied how Google responds in searches and have discovered many of the common things that Google evaluates and values.
While there are seemingly countless SEO elements at work here, both on the page itself and off the page, the number one thing remains true; content has been the number one factor since the beginning. Why? People use words to communicate. They use them in their daily lives and, as I mentioned before, they use them while searching online. Another reason is because the scanning process is done by a computer. Computers read the code that humans and programs have written. If actual text is not present, there is nothing for Google to read. Simply put, if you do not have text, there cannot be a match when a user types in a keyword.