"What are you Talking about?" (Prepositions)

"What are you talking about?"
This question/statement is one of many errors that people make when communicating with eachother. About is a preposition. The rule is that sentences may never in a preposition. Try asking the question like this, "What do you mean"?
Prepositions are the words that indicate location, such as in the physical world. An example I like to use is "the box". If the word can (_blank_) the box, it is a preposition.
Examples: In the box, out the box, out of the box, through the box, beside the box, over the box. These are just a few examples of prepositions.
I will post a list on the comment post.

One of many sources:
http://www.chompchomp.com/terms/preposition.htm