Glossary
Since putting definitions of words in any relevant article is both unnecessary clutter and also very redundant, this page is intended to be a catch all for any term that needs further explanation, but there is not enough written about it for its own page. If an entry in the glossary is becoming too complex, consider creating its own page, and linking to it from here. Don't remove it from here until you have confirmed that nothing else links to it.
Security
While security is a very broad concept that has many definitions, in the concept of software, it mainly refers to ensuring someone cannot interact with your devices in a way that you do not want. For example, accessing data on a device without your permission. Security is most useful when though of through the concept of threat modelling.