website: update terminology

website/source/docs/basics/terminology.html.markdown

@@ -10,20 +10,20 @@ Luckily, there are relatively few. This page documents all the terminology
 required to understand and use Packer. The terminology is in alphabetical
 order for easy referencing.
 
-<a class="term" id="#term-build"></a>
+<a class="term" id="term-artifact"></a>
 **Artifacts** are the results of a single [build](#term-build), and are
 usually a set of IDs or files to represent a machine image. Every [builder](#term-builder)
 produces a single artifact. As an example, in the case of the Amazon EC2 builder,
 the artifact is a set of AMI IDs (one per region). For the VMware builder,
 the artifact is a directory of files comprising the created virtual machine.
 
-<a class="term" id="#term-build"></a>
+<a class="term" id="term-build"></a>
 **Builds** are a single task that eventually produces an image for a single
 platform. Multiple builds run in parallel. Example usage in a sentence: "The Packer build
 produced an AMI to run our web application." Or: "Packer is running the builds
 now for VMware, AWS, and VirtualBox."
 
-<a class="term" id="#term-builder"></a>
+<a class="term" id="term-builder"></a>
 **Builders** are components of Packer that are able to create a machine
 image for a single platform. Builders read in some configuration and use
 that to run and generate a machine image. A builder is invoked as part of a [build](#term-build)
@@ -31,21 +31,27 @@ in order to create the actual resulting images. Example builders include
 VirtualBox, VMware, and Amazon EC2. Builders can be created and added to
 Packer in the form of plugins.
 
-<a class="term" id="#term-command"></a>
+<a class="term" id="term-command"></a>
 **Commands** are sub-commands for the `packer` program that perform some
 job. An example somecommand is "build", which is invoked as `packer build`.
 Packer ships with a set of commands out of the box in order to define
 its [command-line interface](#). Commands can also be created and added to
 Packer in the form of plugins.
 
-<a class="term" id="#term-provisioner"></a>
+<a class="term" id="term-post-processor"></a>
+**Post-processors** are components of Packer that take the result of
+a [builder](#term-builder) or another post-processor and process that to
+create a new [artifact](#term-artifact). Examples of post-processors are
+compress to compress artifacts, upload to upload artifacts, etc.
+
+<a class="term" id="term-provisioner"></a>
 **Provisioners** are components of Packer that install and configure
 software within a running machine prior to that machine being turned
 into a static image. They perform the major work of making the image contain
 useful software. Example provisioners include shell scripts, Chef, Puppet,
 etc.
 
-<a class="term" id="#term-template"></a>
+<a class="term" id="term-template"></a>
 **Templates** are JSON files which define one or more [builds](#term-build)
 by configuring the various components of Packer. Packer is able to read a
 template and use that information to create multiple machine images in