This is the 603rd most frequent Swedish word.
sak
"Thing" or "matter."
In this sentence, 'sak' denotes an object or physical item, specifically the largest item in the room.
Den största saken i rummet är bordet.
The largest thing in the room is the table.
Here, 'sak' is used abstractly to describe an important principle or concept.
Att vara är den viktigaste saken i livet.
To be is the most important thing in life.
In this context, 'saker' (plural form of 'sak') represents multiple personal items or possessions.