A deposition is an out-of-court sworn statement made during a lawsuit. Typically, the lawyer representing the opposing party to a lawsuit will take your deposition to understand information you have about the case. Witnesses to events giving rise to the case may also be asked to give a deposition.
A deposition usually takes place in a conference room at the offices of one of the lawyers that is involved in the case. A person called a "court reporter" is present to administer the oath and to record the testimony. It is possible that the deposition will be recorded by a videographer.
Under Tennessee law, a person who is involved in a lawsuit can be asked to provide information that is "reasonably calculated to lead to admissible evidence in the case." That means that if you file a lawsuit or are sued in a lawsuit you can be asked questions that directly involve the facts of the case and also questions that may lead to information that might find its way to evidence at trial.