A Feature is used to package a group of plug-ins together into a single installable and updatable unit.
Features have a manifest that provides basic information about the feature and its content. Content may include plug-ins, fragments and any other files that are important for the feature. A feature can also include other features. The delivery format for a feature is a JAR, but each included plug-in will be provided as a separate JAR.
Once you have created your plug-ins and fragments you can create a new feature by creating a New Feature Project.
You can also create Feature Patches in PDE. A feature patch is developed in the same fashion as a normal feature, but is used to edit an existing feature rather than create a new one.