promote equity

Most time, people utilize code to keep secret secure. For example, military always has special organization to create code in order to keep crucial communication secure as well as to break enemies' code in order to gain important information. As for daily life, some people will apply code to prevent other people from reading their private blog, only someone who know the author's password can have access to read it.

Actually, code can also promote equity. In our accounting class, sometimes, we have to do quiz on the computer. In order to prevent some student do the quiz earlier or even leak out the question to others, professor set the code. Only until professor tells us the code we could do quiz. In addition, professor will change the code at next quiz. As a result, it promote equity that every one knows the quiz at the first time and starts the quiz at nearly the same time.