লেখচিত্র কাকে বলে? লেখচিত্রের শ্রেণিবিভাগ

Telecommunication is defined as the any transmission, emission, or reception of signs, signals, writing, images and sounds or intelligence of any nature by wire, radio, optical or other electromagnetic systems.

Telecommunications, or telecom, refers to the process of exchanging. information such as voice, data and video transmissions via electronic technologies like telephones (wired and wireless), microwave communications, fiber optics, satellites, radio and television broadcasting, and the internet.