You come across a strange new fruit at the market. You open an email attachment and see a bizarre, unreadable document. A friend tells you a story that makes no sense. In all these moments, the same three words probably pop into your head: "What is this?"

This simple question is a powerful tool for communication. We use it whenever we encounter something unfamiliar, unexpected, or confusing. It’s a direct way to ask for clarification when you’re genuinely puzzled.

The phrase isn't just for physical objects. It also works for situations. If you walk into a room and your friends are laughing hysterically for no apparent reason, you might smile and ask, "Okay, what is this?" to get in on the joke. It can also signal disbelief. Imagine receiving a bill that's ten times higher than usual. Your first reaction would likely be to stare at it and mutter, "What is this? This can't be right."

The meaning of "What is this?" can change dramatically depending on your tone of voice. The same words can express simple curiosity, genuine surprise, or even annoyance.

Think about the different ways you could say it.

Context provides the clues. The situation and your delivery tell the listener whether you're asking for information, expressing frustration, or sharing a funny moment.

A common point of confusion is when to use "this" versus "that." The choice is all about proximity, or how close the object is to you, the speaker.

If you are holding an object or it's right next to you, you use "this." If you are pointing to something across the room or down the street, you use "that."

Time to review what we've covered.

Ready to test your knowledge?

Now you know how to use this common phrase. Whether you're curious, surprised, or annoyed, "What is this?" is a useful question to have in your vocabulary.