Bonjour is a French word for a hello or hi, good morning, good day. The first word you would say to a French human. This is a similar word for Salut and also Salut means hi!
The French way of saying "hello", also used in the first song in Disney's Animated movie "Beauty and the Beast" when she sings about not wanting to live in her boring life.
This is the same as "Hello". It's used the same as well. This is a French word, but you can use it as if it's an English greeting! The direct English translation is "good day".
You pronounce it like: bone-joo-h