The world is what it is. We can make all kinds of maps and models of how the world works, and some of them can be very useful, and we can talk about them with great benefit. But the models and maps and any words one can put together can never do more than approximate the actual world or the actual phenomena being examined. The actual territory is beyond verbal description.
As humans we make abstractions all the time. An “abstraction”, as used here, is that one simplifies, condenses, or symbolizes what is going on in order to better talk about it or think about it.
For example, if I walk down the street, I might experience an event taking place. My perceptions in themselves constitute an abstraction. Different people will experience the event differently, depending on where they perceive it from and how their perceptions work, and it will never be more than a portion of what went on, passed through certain filters of perception. So, I will record certain sights, sounds, feelings and so forth, which will form my representation of the event. I might then start describing what I experienced and that will abstract it further. I could say “I saw two cars, a blue Ford going west and a green Honda going east, and the blue car was going to turn left, but then the green car swerved out of its way and hit it”. My description might give somebody else an idea of what went on, but really it is a very imprecise approximation of what I actually perceived, which is again an imprecise approximation of what actually went on. The next day I might create a further abstraction by simply saying that I saw “an accident”."