This is the 7523rd most frequent Korean word.
케이크를
"Cake" (object form).
In this sentence, '케이크를' serves as the object of the verb '먹다' (to eat), marked by the object particle '를', indicating that the action of eating is directed towards the cake.
저는 케이크를 먹고 싶어요.
I want to eat cake.
Here, '케이크를' is the object of the verb '사다' (to buy), emphasized by the particle '를', denoting that the cake is what was purchased.
생일 축하를 위해 케이크를 샀어요.
I bought a cake for the birthday celebration.
In this usage, '케이크를' is again the object, this time of the verb phrase '나눠 주다' (to share), flagged by '를' to highlight what was distributed.