The way we organize code provides a visual understanding for other coders. We know that the indentation conveys a nested structure. The colours also distinguish different section of code. Here we see that the text following the two slashes (comments) are blue. In this way, we are able to universally convey what we mean. In general, code itself is an info vis since high level languages have words that mean certain things (which are usually a lot more characters in assembly/ low-level languages).

Source: https://jonathannicol.com/blog/2010/09/29/sunset-a-syntax-highlighting-theme-for-phpdesigner/