erobern
to conquer
To take control of an area, city, or country by military force.
Die Armee eroberte die feindliche Festung nach langer Belagerung.
The army conquered the enemy fortress after a long siege.

to conquer
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to conquer
To take control of an area, city, or country by military force.
Die Armee eroberte die feindliche Festung nach langer Belagerung.
The army conquered the enemy fortress after a long siege.

The verb 'erobern' (to conquer) is inseparable. The prefix 'er-' remains firmly attached to the verb in all sentence forms and tenses and is not placed at the end of the sentence.
Die Römer eroberten große Teile Europas.
The Romans conquered large parts of Europe.
The prefix 'er-' often expresses that an action is successfully completed. So 'erobern' (to conquer) means to successfully bring something into one's possession through effort or struggle.
Die Mannschaft eroberte den ersten Platz in der Liga.
The team captured first place in the league.
The exact meaning of 'erobern' (to conquer) depends strongly on the object. If it is a country, a city, or a fortress, the military meaning is intended. With 'Herz' (heart), it is about love; with 'Markt' (market), about economic success; and with 'Gipfel' (summit), about mountaineering.
Das Start-up will den amerikanischen Markt erobern.
The start-up wants to capture the American market.
In a figurative sense, the expression 'jemandes Herz erobern' (to win someone's heart) is very common. It is often used with the addition 'im Sturm' (in no time / overwhelmingly) to describe a quick and overwhelming effect.
Mit seiner freundlichen Art eroberte er die Herzen der Zuschauer im Sturm.
With his friendly manner, he won the audience's hearts in no time.
to reach
'erreichen' and 'erobern' can both mean that you reach a goal after effort. 'erreichen' is neutral and fits places, goals, or states. 'erobern' is stronger and more figurative. It suggests struggle, special effort, or winning something for yourself. For example, you can 'einen Berggipfel erobern' (conquer a mountain summit) if the route was difficult, or 'das Interesse einer Person erobern' (win a person's interest). Learners may confuse the words because 'erobern' can sometimes feel like a particularly strong version of 'erreichen'. In everyday language, 'erreichen' is often more neutral and precise; 'erobern' fits when success, gain, or effort should be emphasized.

Nach vier Stunden Wanderung haben wir endlich den Gipfel erobert.
After four hours of hiking, we finally conquered the summit.
Am Morgen erreicht der Bus trotz Regen pünktlich die Innenstadt.
In the morning, the bus reaches the city center on time despite the rain.