Thomas Edison helped popularize “hello” as a telephone greeting.
When telephone service began expanding in the late nineteenth century, callers and operators did not initially use one universal opening word. Edison advocated “hello,” believing it was clear and easy to hear over telephone lines. The greeting gradually became standard in English-speaking telephone culture.
Alexander Graham Bell reportedly preferred “ahoy,” a nautical call, for telephone conversations. Edison’s practical promotion of “hello” helped the word win wider acceptance, although he did not invent the word itself.
The history is sometimes simplified into the claim that Edison invented “hello.” That is inaccurate: the word existed before the telephone. Edison’s role was in encouraging its use as a telephone greeting, helping shape a convention that spread internationally with telephone technology.