the day that includes the present moment (as opposed to yesterday or tomorrow)
"Today is beautiful"
"did you see today's newspaper?"
A current day or date.
"The weather report says it will rain today, so I'll stay inside and finish my work."
In plain English: Today is the name for the current day you are living right now.
"Today is a wonderful day to visit the park."
On the current day or date.
"We need to finish all these reports today because the deadline is right now."
In plain English: Today is used to mean happening right now or within this specific day.
"We should go for a walk today since the weather is finally nice."
Usage: Use today as an adverb to indicate that something happens on the present calendar day, such as in "I will finish this task today." It functions similarly to now but specifically refers to a 24-hour period rather than just the immediate moment.
Today comes from Middle English and Old English, where it originally meant "on this day" or "this day forward." The word is formed by combining the preposition to with day, a structure that has remained largely unchanged in its core meaning over time.