# Keyword (classic)

A *keyword* or *tag* is a label to differentiate objects of the same type according to a category. For example, the keywords of the predefined category **Application type** help you distinguish among different types of applications by identifying them as **browser**, **mail client** or **antivirus**.

The process of assigning a keyword to an object is called *tagging*. An object can be tagged with at most one keyword per suitable category. Tagging can be either manual or automatic.

***

RELATED CONCEPT

* [Category](https://docs.nexthink.com/platform/references/references-classic/glossary-classic/category-classic)