I have been using Mac for about 12 months and have found it to be really great to use. My question is what is the difference between a Virus and a Trojan and how do they affect your mac. I know you do not get a virus on a mac so what does the Trojan actually do?. Can it harm your machine or damage your data? I do not use my machine for banking or sensitive data and the web sites i use are very boring business related. I do not run any windows os or applications on the machine just mac and mac software which i find runs without any problems. Also do not try to touch much as i have little knowledge so keep my fingers out of things. Thank you.