Goodbye and good bye are both ways to say farewell and show appreciation for the time spent with someone. Both versions of the phrase have the same meaning, but there are subtle differences in the way they are used.
Goodbye is the more formal version of the two phrases. It is used when people are saying their final farewells, usually in a more formal setting such as a business meeting or a social gathering. It is also used when someone is leaving a place, such as a party or an event.
Good bye, on the other hand, is more informal. It is used when saying goodbye to someone in a casual setting, such as a friend or family member. This phrase is also used when someone is simply leaving a place, such as a store or a restaurant.
In conclusion, while both words have the same meaning, they are used in different contexts. Goodbye is more formal and is used when saying farewell in a more formal setting, while good bye is more casual and is used when saying goodbye in a more casual setting.