Versioning

These days you cannot open a computer app without seeing signs like this for an upgrade. What is this all about.
The frequently you see this upgrade notices is a sign of usability. It is a good thing. The cause is usally by one of these reasons:

• A problem was found in a current feature.
• A new feature has been added to improve functionality.
• A security problem was needed to be fixed.

All these reasons are about the the usability of the app. The security problem is addressing a "usability" loophole found by use of the app. Hakers may have found a way to take advantage of new or found usable capability.