What did you have for breakfast?
Breakfast is the first meal of a day, most often eaten in the early morning 
Yeah, sometimes really early.  Breakfast style foods can be eaten anytime though.
There is a strong tendency for one or more "typical", or "traditional", breakfast menus to exist in most places, but the composition of this varies widely from place to place, and has varied over time, so that globally
What would be traditional breakfast where you're from?
Its that which is commonly referred to as "the most important meal of the day", particularly for children, some epidemiological research 
It certainly is.
It was not until the 15th century that “breakfast” came into use in written English to describe a morning meal, which literally means to break the fasting period of the prior night