How can I determine which software I have and whether it needs an upgrade/update?

[toicy4ya]

What's Up Guy's,

I am unfamiliar with my car's software and whether it needs an upgrade/update. I did some research and am a bit unclear. I would greatly appreciate some sound feedback on the following questions;

1. What’s does an upgrade/update generally entail?

2. How can I determine which software I have and whether it needs an upgrade/update?

3. Where can I find information relative to what’s included in each upgrade/update?

4. Is the software upgrade/update only performed at the dealer?

5. What are the general costs associated with a upgrade/update?

Thanks in advance