A more thorough explanation:

A Batson objection is a legal challenge made by one party in a trial to the validity of a peremptory challenge made by the other party. This challenge is made on the grounds that the other party used the peremptory challenge to exclude a potential juror based on their race, ethnicity, or sex.

The name "Batson" comes from the case Batson v. Kentucky, which was a criminal case that held this type of peremptory challenge to be unconstitutional when used by prosecutors.

For example, if a prosecutor in a criminal trial uses a peremptory challenge to exclude a potential juror who is African American, the defense attorney may make a Batson objection, arguing that the prosecutor is excluding the juror based on their race. If the judge agrees with the objection, the prosecutor may have to select a new juror or the trial may be declared a mistrial.

It is important to note that Batson challenges can also be made in civil cases, as seen in the case Edmonson v. Leesville Concrete.