This is the 16th most frequent Hebrew word.
היום
Today.
The word 'היום' (Hayom) is used here to indicate 'today,' specifying the time frame of the activity mentioned.
היום הלכתי לקניות בשוק.
Today I went shopping at the market.
'היום' (Hayom) is again used to refer to 'today,' emphasizing the condition of the day described.
חם מאוד היום, אז כדאי לשתות הרבה מים.
It's very hot today, so it's recommended to drink a lot of water.
In this sentence, 'היום' (Hayom) serves to specify that the celebration will happen on 'today,' adding a temporal context to the future event.