Telephony is the technology used for real-time, two-way communication between people in separate locations via sound, voice, video, fax, or text. The word "telephone" originates from the French "téléphone" (c. 1830), combining "télé-" (far) and "phōnē" (sound, voice), derived from the Proto-Indo-European root "*bha-" (to speak, tell, say).