QUICK ANSWER
"Ciao" is a phrase which is often translated as "bye", and "¡Chau!" is an interjection which is often translated as "Bye!". Learn more about the difference between "ciao" and "¡Chau!" below.
ciao
A phrase is a group of words commonly used together (e.g., once upon a time).
1. (colloquial) (general)
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
c. ciao (colloquial)
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
Ahí viene mi autobús. Ciao!There comes my bus. Ciao!
d. cheerio (colloquial) (United Kingdom)
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
Regionalism used in the United Kingdom
Me tengo que ir. Ciao!I have to leave now. Cheerio!
¡Chau!(
chow
)An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
1. (colloquial) (farewell) (Latin America)
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
Regionalism used in Latin America: all the countries in South America, Central America, and the Caribbean. Does not include Spain.
e. Ciao! (colloquial)
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
Te llamo más tarde. ¡Chau!I'll call you later. Ciao!
f. Cheerio! (colloquial) (United Kingdom)
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
Regionalism used in the United Kingdom
Se hace tarde. ¡Chau!It's getting late. Cheerio!
