All you really need to know is that these two languages are the basic building blocks of websites. HTML5 is like the foundation and framing used to build a house. It provides web browsers with instructions on how to structure and display content. CSS3, on the other hand is like the details that make a house unique: paint, landscaping, furniture, and art. CSS3 takes care of the overall aesthetics of your website.

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HTML5 and CSS3 are complementary technologies that aren't terribly useful when not used together. Both are required components of responsive web design. For example, CSS3 provides different layout and aesthetic instructions based on the device accessing a website, so that a website may show or hide certain things if the user is accessing it on an iPhone instead of laptop.