@ngdoc overview
@name Developer Guide: Templates: Understanding Angular Filters
@description

Angular filters format data for display to the user. In addition to formatting data, filters can
also modify the DOM. This allows filters to handle tasks such as conditionally applying CSS styles
to filtered output.

For example, you might have a data object that needs to be formatted according to the locale before
displaying it to the user. You can pass expressions through a chain of filters like this:

        name | uppercase

The expression evaluator simply passes the value of name to
{@link api/angular.module.ng.$filter.uppercase uppercase filter}.

In addition to formatting data, filters can also modify the DOM. This allows filters to handle
tasks such as conditionally applying CSS styles to filtered output.


## Related Topics

* {@link dev_guide.templates.filters.using_filters Using Angular Filters}
* {@link dev_guide.templates.filters.creating_filters Creating Angular Filters}

## Related API

* {@link api/angular.module.ng.$filter Angular Filter API}
