Security or Usability

hello experts , can someone explain to me in the example the difference between Security and Usability and visibility? and is usability will have the same meaning as visibility on the widget level?  
1 answers

Visibility only defines if you can see something. Depending on the security you can also restrict this. So you might be able to see something in the page due to visibility but due to security restrictions you still will not see the object (or edit it). And visibility is no security. You could hide an object but the user could still change the object with javascript if your security is not in order.

And usability is something else completely. That has more to do with the design of your page and if you guide your users in a logic and cosistent manner through your application.