+########################
+
+.. contents::
+ :depth: 1
+
+The Drools PDP, aka PDP-D, is the PDP in the Policy Framework that uses the
+`Drools BRMS <https://www.drools.org/>`__ to enforce policies.
+
+The PDP-D functionality has been partitioned into two functional areas:
+
+- PDP-D Engine.
+- PDP-D Applications.
+
+**PDP-D Engine**
+
+The PDP-D Engine is the infrastructure that *policy applications* use.
+It provides networking services, resource grouping, and diagnostics.
+
+The PDP-D Engine supports the following Tosca Native Policy Types:
+
+- onap.policies.native.Drools
+- onap.policies.native.drools.Controller
+
+These types are used to dynamically add and configure new application controllers.