This is the 280th most frequent Korean word.
왔다
"왔다" means "came" in English.
Here, the word '왔다' is the past tense form of '오다' (to come), and it indicates the action of arriving at a place from a previous location.
그는 어제 서울에 왔다.
He came to Seoul yesterday.
In this usage, '왔다' is still the past tense form of '오다' but is used metaphorically to indicate the changing seasons.
드디어 봄이 왔다.
Finally, spring has arrived.
'왔다' here represents achieving a specified result (coming in first place) in the context of an event.