What is a cryptocurrency security token?

Could you elaborate on what a cryptocurrency security token precisely entails? As I understand, it differs from traditional cryptocurrencies in some fundamental ways. Specifically, I'm interested in knowing if these tokens represent ownership or stake in a company, asset, or investment contract. Do they offer holders certain rights or privileges, such as voting rights or dividend payments? Are they subject to the same regulatory oversight as traditional securities? Lastly, how are they traded and what are the key factors investors should consider before purchasing such tokens? Thank you for clarifying.