Using Segmented Controls vs Tab bar

I have to document the general possibilities of an iOS app structure for my team, so I'm reading the guidelines to all the navigation and control structures.
But I can't seem to understand when to use Segmented Controls and when a Tab bar.

In the iOS Human Interface Guidelines it says

A segmented control is a linear set of segments, each of which functions as a button that can display a different view.
Use a segmented control to offer choices that are closely related but mutually exclusive.

For the Tab bar it says

A tab bar gives people the ability to switch between different subtasks, views, or modes in an app.
Use a tab bar to give users access to different perspectives on the same set of data or different subtasks related to the overall function of your app.

The examples used (tabs on top, segmented controls on bottom):

So it seems the main difference is that the Segmented Control is for switching between related views, while the Tabs are used to "sort" the displayed content, is that correct?
I've also seen other applications do it in complete reverse, so are they doing it wrong or is there just really no big difference at all?