I serialized a few Sitecore items to keep them on my version control system using the following menu:
And now I must find them to finish my task.
Where exactly are those files?
The previous answer is correct for default configuration on Sitecore 8 or 9.
The serialization folder path can be set using next setting .
<!-- SERIALIZATION FOLDER
Points to the root of serialized databases tree (when using serialization functionality).
Default value: $(dataFolder)/serialization
-->
<setting name="SerializationFolder" value="$(dataFolder)/serialization" />
Above setting is part of the Sitecore.config and is relative to dataFolder.
If you want to change the SerializationFolder I recommend you to path this setting using patch config. dataFolder setting is defined like a sitecore variable:
<sc.variable name="dataFolder" value="/App_Data" />
It depends on which major version you are using.
If you are using Sitecore 8.x or lower:
If you are using Sitecore 9.x or higher: