It's a term used to describe a man who is polite, courteous, and respectful, often with a sense of honor and chivalry.
Here are some examples of how "caballero" can be used:
* "Un caballero de verdad siempre es amable con las damas." (A true gentleman is always kind to women.)
* "El rey Arturo era un famoso caballero de la mesa redonda." (King Arthur was a famous knight of the round table.)
* "Por favor, siéntese, caballero." (Please, have a seat, sir.)
However, "caballero" is not just a word for a "man." It has a connotation of possessing certain positive qualities that not all men possess.