Short reply
Used when you have a response related to the question by using '요' as the short answer. A way to reply with just a noun, without having to repeat any of what has just been said. Also written as 이요.
The same can be done in English. Eg. "What is your name?".
Long answer "My name is John."
Short answer "John".
Since it would be rude in Korean to just say "John". You can add this 요.