What is "Social Enginnering"?

Recently, some people get money by confidence trick on the Internet. <http://en.wikipedia.org/wiki/Social_engineering_(computer_security)>For example, in Japan, there are "one click fraud" and "being sent a make-believe account."　"One click fraud" is a kind of fraud. When someone check e-mails and open a spam mail and click, it jumps to admission page of the web page, like sexual or illegal shopping, and he already finish the proceeding of admission. Moreover, he will be charged money on the Internet. For example, the web page jumps that charging page. But he shouldn't pay for it because it is illegal. So, I think that the best way to dealing with it is just neglecting. "being sent a make-believe" is similar to "One click fraud". Sometimes after opening charging page, he will actually get the account or called from the company that is nonexistent.