How Does an Arc-Second Help Hubble Telescope See Fine Details in Space?

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The Hubble Telescope has a resolution of about 0.1 arc-seconds, which refers to its ability to distinguish between two closely spaced objects in space. One degree is divided into 60 arc-minutes, and each arc-minute is further divided into 60 arc-seconds, making 0.1 arc-seconds a very small angle. This resolution allows Hubble to observe fine details in astronomical objects, such as stars, that have angular sizes smaller than this measurement. However, it can only identify two stars as separate entities if they are positioned at an angle greater than 0.1 arc-seconds apart. Understanding this resolving power is crucial for grasping Hubble's capabilities in observing distant celestial phenomena.
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I looked it up in several areas on the web but nothing really helped, there is no definition in my physics book. anyway, I had a question about the Hubble telescope and I found its resolution to be about 0.1 arc-seconds . Thats great and all but what does that mean really? for example, how small an item is the Hubble able to see with that resolution?
 
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One degree of angle is divided into 60 minutes, each minute is divided into 60 seconds. So the number given is a very small angle. But this number is actually the resolving power. Hubble can see stars that have angular disk sizes much smaller than this. But it can only see two of them as distinct objects if they are separated by a larger angle than this.
 

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