An empress is a female ruler of an empire or the wife of an emperor. Here are some additional details about empresses:

• Empresses can be either a female emperor or the wife of an emperor.
• Empresses are powerful women who have absolute power over a country.
• Empresses can be referred to as "The Empress" and are often given this title before their name).
• Empresses can be found in history, such as Catherine the Great, who was Empress of Russia.

In summary, an empress is a female ruler of an empire or the wife of an emperor, and they are powerful women who have had a significant impact on history.