Radiotelegram, also known as wireless telegram, refers to a message sent by radio waves instead of wires. This type of communication was very popular in the early 20th century when radio technology was still fresh. Its usage has declined over the years due to the invention of more advanced communication methods such as email and instant messaging. Synonyms for radiotelegrams include radio message, wireless message, radio communication, wireless communication, and radio transmission. Although not as commonly used today, radiotelegrams were crucial in providing crucial and timely communication during emergency situations such as natural disasters and wars.