die Königin
queen
The female ruler of a kingdom.
Königin Margrethe II. war Staatsoberhaupt von Dänemark.
Queen Margrethe II was the head of state of Denmark.

queen
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queen
The female ruler of a kingdom.
Königin Margrethe II. war Staatsoberhaupt von Dänemark.
Queen Margrethe II was the head of state of Denmark.

The word 'Königin' (queen) is the feminine form of 'der König' (the king). The ending '-in' is used very frequently in German to form the feminine form from a masculine person or profession noun.
Die Königin regierte das Land weise.
The queen ruled the country wisely.
'Königin' (queen) belongs to the word family around 'der König' (the king). The adjective 'königlich' (royal) also belongs to it and describes things that belong to a king or queen, or are worthy of them.
Die Familie besuchte das königliche Schloss.
The family visited the royal castle.
The context tells you whether a ruling monarch or the wife of a king is meant. A female ruler is often mentioned together with her country (e.g., 'Königin von England' — Queen of England), while the wife is often mentioned together with the king.
Die Königin von Spanien hielt eine Rede.
The queen of Spain gave a speech.
In the figurative meaning, 'Königin' (queen) is often used as the second part of compound words. Examples are 'Ballkönigin' (prom queen), 'Weinkönigin' (wine queen), or 'Schützenkönigin' (shooting queen / markswoman queen).
Zur Eröffnung des Weinfestes wurde die neue Weinkönigin gekrönt.
At the opening of the wine festival, the new wine queen was crowned.
In chess, the queen is the strongest piece. Typical verbs in this context are 'die Königin opfern' (to sacrifice the queen), 'die Königin bewegen' (to move the queen), or 'mit der Königin schlagen' (to capture with the queen).
Er opferte seine Königin, um das Spiel zu gewinnen.
He sacrificed his queen to win the game.
This meaning occurs only in a biological context. The word is usually combined with the insect species, for example 'Bienenkönigin' (queen bee) or 'Ameisenkönigin' (queen ant).
Forscher haben die Bienenkönigin mit einem Punkt markiert.
Researchers marked the queen bee with a dot.
king
'der König' and 'die Königin' often belong to the same topic area, but they are not simply interchangeable. 'der König' is the masculine form and means a male ruler. 'die Königin' can be a female ruler, but also the wife of a king. In chess, the difference is especially important: the king is the piece that must be protected, while the queen is the strongest piece. The words can be confused because both fit monarchy, chess, and figurative titles. So pay attention to gender, role, and context.

Die Königin zog über das ganze Brett und schlug den Turm.
The queen moved across the whole board and captured the rook.
Beim Schach darf der König nicht im Schach stehen bleiben.
In chess, the king must not remain in check.