It can be used for expressing motion or direction toward a point, person, place, or thing approached and reached, as opposed to "from".
Example sentence: "They came to the house."
Yes, I used and exact dictionary definition... Here are some more example sentences, though:
"I'm going TO the store."
"He hates TO dance."
"Where did you go TO?"
"I went from here TO there."
Hope this made some sort of sense.