From d00cfd4c549c21a72fd1d6ed251c8a77f114503f Mon Sep 17 00:00:00 2001
From: Angelos Chalaris <chalarangelo@gmail.com>
Date: Mon, 16 Jul 2018 20:45:40 +0300
Subject: [PATCH] Add glossary/callback

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 glossary/callback.md | 4 ++++
 1 file changed, 4 insertions(+)
 create mode 100644 glossary/callback.md

diff --git a/glossary/callback.md b/glossary/callback.md
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+### callback
+
+A callback function, also known as a high-order function, is a function that is passed into another function as an argument, which is then executed inside the outer function.
+Callbacks can be synchronous or asynchronous.