der Sieg
victory
The successful outcome of a fight, competition, or conflict in which one overcomes an opponent.
Der Sieg der Mannschaft wurde von den Fans laut bejubelt.
The team's victory was loudly cheered by the fans.

victory
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victory
The successful outcome of a fight, competition, or conflict in which one overcomes an opponent.
Der Sieg der Mannschaft wurde von den Fans laut bejubelt.
The team's victory was loudly cheered by the fans.

'Der Sieg' (victory) is the noun related to the verb 'siegen' (to win). A person who wins is called 'der Sieger' (the male winner) or 'die Siegerin' (the female winner).
Die Siegerin des Wettbewerbs erhielt eine Goldmedaille.
The winner of the competition received a gold medal.
'Sieg' (victory) is very often used with the preposition 'über' (over) and the accusative to name the defeated opponent. This applies to both the literal and the figurative meaning.
Der Sieg über den Weltmeister war eine große Überraschung.
The victory over the world champion was a big surprise.
Common verbs with 'Sieg' (victory) are 'einen Sieg erringen' (to achieve a victory) or 'einen Sieg davontragen' (to carry off a victory). Typical adjectives are 'ein knapper Sieg' (a narrow victory) or 'ein klarer Sieg' (a clear victory).
Die Mannschaft konnte in letzter Minute einen knappen Sieg erringen.
The team managed to achieve a narrow victory in the last minute.
success
'der Erfolg' and 'der Sieg' both describe something positive that you achieve. However, 'Sieg' is used mainly when there is an opponent, for example in sports, in a competition, or in a fight. 'Erfolg' is more general: you can also have success in an exam, in a project, or with a plan without winning against someone. The words can be confused because a 'Sieg' is often an 'Erfolg'. But an 'Erfolg' is not always a 'Sieg'. When a competition or opponent is important, 'Sieg' sounds more precise.

Nach dem letzten Tor feierte die Mannschaft ihren Sieg.
After the last goal, the team celebrated its victory.
Die neue Bewerbung war ein Erfolg, denn Max hat die Stelle bekommen.
The new job application was a success, because Max got the position.