Why does good-bye have a hyphen?

"Good-bye" traditionally has a hyphen to indicate that it is a compound Word formed from "good" and "bye," which is a variation of "goodbye." The hyphen helps clarify the relationship between the two parts, signaling that they combine to convey a single idea of parting. However, it is commonly written as "goodbye" without a hyphen in modern usage. The hyphenated form is less common today but can still be seen in certain contexts.