Rockwell Automation FactoryTalk Historian SE ProcessBook 3.2 User Guide - Manual (Page 249)

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Data Streams
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Contextual data Contextual data is a method of associating FactoryTalk Historian
points and their properties with their business use, location, service or
role. By configuring this information to reflect the correct structure of
the information, the content creator can make data and its
presentation more logical and accessible to the user community. A
FactoryTalk Historian point tag name is an example of contextual
data.
FactoryTalk Historian points also have various configurable properties
associated with the data stream, called point attributes. However, this
information is presented largely in language relevant to data
processing, not in measurements or standard business terms that are
easily accessible to users outside the Operations department.
FactoryTalk Historian AF provides a holding place for contextual
representations of all data used in your FactoryTalk Historian system.
Elements and attributes can reference FactoryTalk Historian points
and attributes or data in other systems, including relational databases
and web services.
FactoryTalk Historian Tags (Points)
A FactoryTalk Historian point is a stream of real-time data from a defined
source, and is described by a corresponding tag name and other attributes.
FactoryTalk Historian points are frequently referred to as FactoryTalk
Historian tags, and the terms are used somewhat interchangeably.
However, a tag is simply a name for a FactoryTalk Historian point. When
you retrieve FactoryTalk Historian data into a dynamic symbol, the tag
name is the most commonly-used FactoryTalk Historian attribute to refer
to data from a FactoryTalk Historian point.
FactoryTalk Historian Tag Search
The Tag Search dialog box is used to locate FactoryTalk Historian tags
(page 231). To launch this dialog box: