die Übereinstimmung
agreement
The state in which two or more people have the same opinion or view; a consensus.
Nach langer Diskussion erzielten die Parteien eine Übereinstimmung.
After a long discussion, the parties reached an agreement.

agreement / correspondence
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agreement
The state in which two or more people have the same opinion or view; a consensus.
Nach langer Diskussion erzielten die Parteien eine Übereinstimmung.
After a long discussion, the parties reached an agreement.

The word is derived from the verb 'übereinstimmen' (to agree / correspond). This verb consists of 'über' and 'einstimmen' (to be in agreement as a unit). The ending '-ung' turns it into a feminine noun that describes a state or process.
Es ist das Ziel der Verhandlungen, eine Übereinstimmung zu finden.
The goal of the negotiations is to find an agreement.
The context makes clear which meaning is intended. If it is about people or groups reaching agreement, it means agreement of opinion. If it is about data, facts, or objects, it means factual correspondence.
Die Übereinstimmung im Team war die Basis für den Erfolg.
The agreement within the team was the basis for success.
When it is about an agreement between people, 'Übereinstimmung' (agreement) is often combined with verbs like 'erzielen' (to achieve), 'erreichen' (to reach), or 'finden' (to find).
Die Minister konnten in der wichtigen Frage keine Übereinstimmung erzielen.
The ministers could not reach an agreement on the important issue.
To express that things fit together, people often use the combinations 'eine hohe/große Übereinstimmung zeigen' (to show a high/strong correspondence) or 'es besteht eine Übereinstimmung zwischen...' (there is a correspondence between...).
Die Daten zeigen eine große Übereinstimmung mit unserer Hypothese.
The data show a strong correspondence with our hypothesis.
The expression 'in Übereinstimmung mit' (in accordance with) is a fixed unit and is always used with the dative. It is typical of formal or legal language.
Wir handeln stets in Übereinstimmung mit den Wünschen unserer Kunden.
We always act in accordance with the wishes of our customers.
corresponding / according
'entsprechend' and 'die Übereinstimmung' both have to do with fitting a rule, statement, or requirement. 'entsprechend' is used directly in a sentence when something happens according to a rule or in a way that fits a situation. 'die Übereinstimmung' is a noun and means the state in which two things match or are the same. In the fixed expression 'in Übereinstimmung mit' (in accordance with), it sounds more formal and means something similar to 'entsprechend' or 'gemäß' (according to). Learners may confuse the words because they can seem similar in formal texts. In everyday language, 'entsprechend' is often simpler and shorter.

Die Übereinstimmung der beiden Aussagen hat die Polizei überrascht.
The match between the two statements surprised the police.
Samir plant die Reise entsprechend dem Wetterbericht.
Samir plans the trip according to the weather forecast.