A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.
For issues related to samba in elementary OS
Questions relating to Microsoft's Skype VOIP (Voice Over Internet Protocol) application and services.
Questions related to the sudo command that allows users to run programs with the privileges of a different user (normally the root user).
the default video player application on elementary OS. For questions about video players in general, use the "video-player" tag.
Questions about how to use/mount/burn/create ISO images.
Questions relating to Android devices and elementary OS.
For questions related to ibus issues in elementary OS
for web developers seeking support for any web development software, for example Apache and PHP.
Integrated development environment
For questions related to issues on Chromebook and elementary OS
for questions about making elementary OS more accessible for users with disabilities, whether through the built-in features of the OS or additions
For questions related to shell issues in elementary OS
a popular subscription-based streaming media service, best known for streaming music
the "/home" folder off of root that contains user data
For SSH related issues in elementary OS