diff --git a/Types-of-Handlers.md b/Types-of-Handlers.md
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--- a/Types-of-Handlers.md
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@@ -1 +1,8 @@
-TODO
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+A `Handler` is an instance derived from the base class [telegram.ext.Handler](https://python-telegram-bot.readthedocs.io/en/latest/telegram.ext.handler.html#telegram.ext.Handler) which is responsible for the routing of different kinds of updates (text, audio, inlinequery, button presses, ...) to their _corresponding callback function_ in your code.
+For example, if you want your bot to respond to the command `/start`, you can use a [CommandHandler](https://python-telegram-bot.readthedocs.io/en/latest/telegram.ext.commandhandler.html) that maps the input to a callback:
+```
+def my_start_callback(bot, update):
+    update.message.reply_text("Welcome to my awesome bot!")
+
+...
+dispatcher.add_handler(CommandHandler("start", my_callback))```
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