Thither means “to that place” or “in that direction.” It's an old-fashioned way of saying “there” when you're talking about movement toward somewhere. If a knight in a medieval story sees a castle on a distant hill and rides thither, he's riding toward it.

The word comes up mostly in older books and poetry. You might read that a character “wandered hither and thither,” meaning they walked around in different directions, back and forth, without any clear destination. Hither means “to this place” (toward the speaker), while thither means “to that place” (away from the speaker).

Today, people rarely use thither in everyday conversation. We simply say “there” or “over there” instead. But you'll still encounter it in classic literature, historical documents, and sometimes in formal or poetic writing where the author wants an old-fashioned or elevated tone. Understanding thither helps you read older texts and see how English has changed over time.