der Ausschnitt
neckline
The opening in a piece of clothing for the neck and the upper part of the chest.
Das Kleid hat einen sehr tiefen Ausschnitt.
The dress has a very low neckline.

neckline / excerpt / clipping
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neckline
The opening in a piece of clothing for the neck and the upper part of the chest.
Das Kleid hat einen sehr tiefen Ausschnitt.
The dress has a very low neckline.

The word 'Ausschnitt' (neckline/excerpt/clipping) is derived from the verb 'ausschneiden' (to cut out). This connection helps you understand all the meanings: you cut an opening into clothing, a part out of a film, or a piece out of a newspaper.
Für meine Collage habe ich interessante Bilder aus Magazinen ausgeschnitten.
For my collage, I cut interesting pictures out of magazines.
You can recognize the meaning of 'Ausschnitt' (neckline/excerpt/clipping) from the context. If it is about clothing, it means the neck opening. In the context of media (film, book), it means a part of the work. If it refers to paper, it means a piece that has been cut out.
Der Regisseur zeigte uns einen Ausschnitt aus seinem neuen Film.
The director showed us an excerpt from his new film.
When it is about clothing, 'Ausschnitt' (neckline) is often combined with adjectives that describe its shape or depth. Typical examples are 'tiefer Ausschnitt' (low neckline), 'runder Ausschnitt' (round neckline), or 'V-Ausschnitt' (V-neckline).
Für das Büro trägt sie lieber Blusen mit einem nicht so tiefen Ausschnitt.
For the office, she prefers to wear blouses with a neckline that isn't so low.
When 'Ausschnitt' (excerpt) describes a part of something larger, this is expressed with the preposition 'aus' (from) and the dative. You see an excerpt from a film or read an excerpt from a book.
Im Radio lief nur ein kurzer Ausschnitt aus dem langen Interview.
On the radio, they played only a short excerpt from the long interview.
section
'der Abschnitt' and 'der Ausschnitt' both mean a part of something larger. 'Abschnitt' is used when this part belongs to an order or structure, for example in a text, along a route, or in a process. 'Ausschnitt' more often means a selected part that is shown from a picture, film, text, or scene. In that case, you see or read only part of the whole. Learners may confuse the words especially with texts. An Abschnitt is an ordered section within a text; an Ausschnitt is a part that has been taken out or selected.

Im Unterricht sehen wir nur einen kurzen Ausschnitt aus dem Film.
In class, we are only watching a short excerpt from the film.
Dieser Abschnitt des Vertrags ist besonders wichtig.
This section of the contract is especially important.