Tags are [JSup] variables used to handle / exchange / store / process data. They hold a '''data''' of some [JSup Tag type|'''type'''] and can be used directly or in expressions in [JSup Graphic objects|graphic object] [JSup Animations|Animation] or other [JSup code].

Some [JSup System tags|system tags] are always defined and not changeable, the others are created by the [JSup application] developer as necessary or [JSup Tag advanced reference#Tags import/export|imported] by external systems.

A tag has many properties/attributes that define it:
 * The '''[JSup domains|domain]''' it belongs to.
 * The '''name''': an [JSup unique names|unique name] that identify it.
 * The [JSup Tag type|'''type'''], which determines the type of data the tag will hold.
 * The '''[JSup Tag classes|tag class]''' that determines many behaviours and properties of the tag.
 * The '''[JSup alarm groups|alarm group]''' that let you to group tag and their related [JSup tag alarms|alarms] by physical or logical areas (or other kind of category).
 * [IOHook|'''I/O hook(s)'''] that connect the tag with some remote device item.
== About tags ==
 * [JSup Tag list dialog|Tag List dialog]
 * [JSup Tag dialog|Tag dialog]
 * [JSup Tag IO definition|Tag I/O definition]
 * [JSup Using tag properties|Using tag properties]
 * [JSup tag initial value|Tag initial value]
 * [JSup tag quality]
 * [JSup cross reference]
 * [JSup Tag advanced reference|Tag advanced reference]