I understand some of the things that hackers can do like sending a malicious application when I download something. That application can steal me data, mess with my computer etc. Is this the only way hacking can be done? You can't really access someone's else's server and look at their data so I suppose the only security issue is the availability of dangerous software on the internet? But I know there is more - what else are the threats? I have not studied about computer networks and security yet so I am really uneducated in this field.