World War I is considered the first “modern” war, due to the fact that many technological advancements in warfare were implemented during this conflict.
One of the biggest innovations was definitely the introduction of radio communication. This type of technology was already in use prior the war, often used by ships transmitting messages with Morse code.
The most crucial improvement allowed by the advancement of radio technology was the possibility of wireless voice communication. This offered an endless number of advantages, for example enabling recon operators to warn the troops beforehand in case of a gas attack. it also was a fundamental step in the estabilishment of air warfare.