
abgrenzen
to delimit
To draw a spatial or physical boundary in order to separate one area from another.
Wir haben unseren Garten mit einem Zaun vom Nachbargrundstück abgegrenzt.
We delimited our garden from the neighboring property with a fence.
to delimit / distance / distinguish
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to delimit
To draw a spatial or physical boundary in order to separate one area from another.
Wir haben unseren Garten mit einem Zaun vom Nachbargrundstück abgegrenzt.
We delimited our garden from the neighboring property with a fence.

to distance oneself from
To consciously distance oneself from a person, group, or opinion in order to show one's own independence or a different stance.
Als Teenager versucht man oft, sich von den Eltern abzugrenzen.
As a teenager, you often try to distance yourself from your parents.

to distinguish
To clearly distinguish and define two or more terms, concepts, or topics from one another in terms of content.
In der Diskussion müssen wir die wirtschaftlichen von den sozialen Aspekten klar abgrenzen.
In the discussion, we need to clearly distinguish the economic aspects from the social ones.
'Abgrenzen' (to delimit / distance / distinguish) is a separable verb. In a main clause, the prefix 'ab-' goes at the end of the sentence. In subordinate clauses and in the infinitive with 'zu', the verb stays together.
Der Gärtner grenzt das Blumenbeet mit Steinen ab.
The gardener borders off the flower bed with stones.
The verb is derived from the noun 'die Grenze' (the border/boundary). The prefix 'ab-' reinforces the idea of separation. So it is always about drawing a clear line.
Man muss lernen, die eigenen Bedürfnisse klar abzugrenzen.
You have to learn to clearly define your own needs.
You can recognize the meaning from the object and the grammar. If it is about a physical place (garden, area), it refers to spatial separation. If the verb is reflexive ('sich abgrenzen'), it is about social distancing. With abstract objects (terms, topics), it means distinguishing content or meaning.
Wir grenzen den Spielbereich für die Kinder ab.
We mark off the play area for the children.
In the meaning 'sich distanzieren' (to distance oneself), the verb is always reflexive and is used with the fixed preposition 'von' + dative. So the structure is: sich von jemandem/etwas abgrenzen (to distance oneself from someone/something).
Das Unternehmen grenzt sich klar von illegalen Praktiken ab.
The company clearly distances itself from illegal practices.
to distinguish
Here, unterscheiden means recognizing or identifying an existing difference between two terms. Abgrenzen goes further and clearly establishes where the content of one term ends and the other begins. For a precise definition, abgrenzen is therefore often the better choice.

In der Definition grenzt die Autorin den Begriff Arbeit klar vom Begriff Beruf ab.
In the definition, the author clearly distinguishes the term work from the term occupation.
Im Text unterscheidet die Autorin die Begriffe Arbeit und Beruf.
In the text, the author distinguishes between the terms work and occupation.