Computer is commonly used in modern society.  It is very useful and convenient.  We can get good and useful information from that.  However, sometimes it is not good because there are lots of crimes.  For example, there are frauds, lots of spam mails, hacking and so on.  One of my friends, she suffer fraud form online shopping mall.  She did not reward from anyone.  I think that ethics need to lots of Korean.  Do you agree with me?