der Kläger
plaintiff
A person or party who files a lawsuit against another person or party in a civil court.
Der Kläger fordert von dem Unternehmen eine hohe Summe Schadensersatz.
The plaintiff is demanding a large sum in damages from the company.

plaintiff
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plaintiff
A person or party who files a lawsuit against another person or party in a civil court.
Der Kläger fordert von dem Unternehmen eine hohe Summe Schadensersatz.
The plaintiff is demanding a large sum in damages from the company.

The word 'Kläger' (plaintiff) comes directly from the verb 'klagen', which means 'to complain' or 'to bring charges/take legal action in court'. A 'Kläger' is therefore the person who files a lawsuit. The feminine form is 'die Klägerin' (female plaintiff).
Der Kläger reichte eine Klage wegen Vertragsbruchs ein.
The plaintiff filed a lawsuit for breach of contract.
'Kläger' (plaintiff) is a technical term from legal language and is mainly used in the context of court proceedings. It is the formal term for the person who initiates a civil lawsuit.
Vor Gericht müssen sowohl der Kläger als auch der Beklagte aussagen.
In court, both the plaintiff and the defendant must testify.
A plaintiff is the active party in a civil lawsuit. Typical verbs used with 'Kläger' (plaintiff) are 'eine Klage einreichen' (to file a lawsuit), 'Schadensersatz fordern' (to demand damages), or 'Berufung einlegen' (to file an appeal).
Der Kläger fordert eine Entschädigung für den entstandenen Schaden.
The plaintiff is demanding compensation for the damage caused.
public prosecutor
'der Staatsanwalt' and 'der Kläger' can both be on the side in a court case that brings something against another person. However, they belong to different areas. The public prosecutor acts on behalf of the state in criminal proceedings and prosecutes a criminal offense. The plaintiff is a person or party who files a lawsuit themselves in a civil court, for example over money, a contract, or damages. Learners may confuse the words because both appear against someone in court. Remember: criminal cases and the state go with 'Staatsanwalt'; a civil lawsuit brought by a person goes with 'Kläger'.

Der Kläger verlangt vor Gericht Geld, weil der Handwerker den Schaden nicht repariert hat.
The plaintiff is demanding money in court because the tradesman did not repair the damage.
Am Montag spricht der Richter zuerst mit dem Staatsanwalt über die Beweise.
On Monday, the judge first speaks with the public prosecutor about the evidence.