The Vietnamese word "hôm nay" means "today" in English. It is a noun that refers to the current day, the time from midnight to midnight.
Hôm nay tôi đi học.
(Today I am going to school.)
Hôm nay là thứ Bảy.
(Today is Saturday.)
In summary, "hôm nay" is a fundamental word in Vietnamese that helps learners talk about what is happening on the current day.