What Is "Social Engineering"?

Social Engineering is the act that search secret information to artificially release security. For instance, if you try to find secret information by searching rubbish, or try to get them by disguising your position, your acts are applicable to social engineering. Stealing or tapping are also applicable to social engineering.

Now, I have many pass words for a cell phone, a computer, a cash card, and so on. Some poster says that don't use a simple pass word like what is based on a birthday because it can be easily decoded. However, if I set a pass word complicated, it can be forgotten easily at least for me. Even if I note it, it accompanies the risk of social engineering. Thus, I have to compare a low risk that can sometimes happen with high risk that rarely happen. Probably, I will chose the former because it is more convenient than the latter.