A classification is a way of categorizing Analytics variable data, then displaying the data in different ways when you generate reports. You establish a relationship between a variable value and metadata related to that value. Classifications can be used on most custom dimensions, such as Tracking code, props, and eVars.
Adobe offers multiple ways to classify data. All classification data operates the same in reporting, and you can combine any of these methods that best fit your organization. Adobe recommends using Classification sets.
Once a dimension contains classification data, a new dimension is available in reporting that contains only classification dimension items. For example, you can classify Product IDs with additional product attributes, such as product name, color, size, description, and SKU. Augmenting reporting and analytics data with additional attributes provides deeper and more complex reporting opportunities.
A single dimension can have multiple classification dimensions. For example, you can classify Tracking Code by Search Engine, Keyword, and Campaign Channel.