Beginning AutoCAD 2006

Three types of blocks have been investigated, these being:
Block
allow user created objects to be multiple inserted into the current drawing
the Design Center allows these blocks to be inserted into any opened drawing
attributes can be attached to a block definition
when the original block object is modified, the current drawing will display the changes.
Wblock
a drawing file which can be inserted into any opened drawing
all users have access to the drawing file
modifying the original drawing file will not change any drawing using the inserted wblock.
Xref
a drawing file and can be inserted into any opened drawing
all users have access to the drawing file
modifying the original xref will automatically update all drawings using the inserted xref.
these blocks can be considered as 'static', the user having to modify the original objects if an alteration is required.
A dynamic block is made and inserted as 'ordinary' blocks but:
it has flexibility and intelligence
it can be modified while the user is working on a drawing
the block geometry can be modified with grips and properties.
The terminology associated with dynamic blocks are:
Action
defines how the geometry will change when the properties are altered
a dynamic block must have at least one associated parameter action.
Parameter
defines properties of position, distance and angles
custom grips and properties are used to manipulate the block.
Block Editor
used to create a dynamic block
the dynamic block can be a new set...