Today means this very day, the 24-hour period you're living through right now. When your teacher assigns homework today, she means you should do it before this day ends. When someone asks “What are you doing today?” they want to know about your plans for the hours between when you woke up this morning and when you'll go to bed tonight.

The word helps us distinguish the present moment from yesterday (the day that just passed) or tomorrow (the day coming next). If you tell your friend “I'll see you today,” you mean before the sun sets and rises again. If the library book is due today, you need to return it before the day ends, not tomorrow morning.

Today also appears in phrases that mean “in modern times” or “in the current era.” When someone says “Schools today use computers,” they're comparing the present to how things used to be. Or if a museum guide explains “Today we understand more about dinosaurs than scientists did fifty years ago,” she's talking about our current knowledge versus the past.

It's a simple word that anchors us in the present, reminding us that this day, today, is the one we can actually do something about.