So I've had a custom built pc for a long time now and I've never bought any kind of anti-virus software or whatever else people install on their pcs. All I know is that my parents computer drives me insane with "NORTON NORTON NORTON" notifications every other minute. They ask me what to get but I myself have never used any software of the sorts. I've just used good judgement on what websites I frequent and never click any links that I'm unfamiliar with. I have some friends who use MalwareBytes but I still don't know what that's for either. So basically I'm asking what are the categories of software and which ones should you really be using?