I think module is not one of the theee basic structure
A designer should always balance the placement of text and
graphics and create room for every element to breathe. When this is followed,
the flyer template will create a feeling of balance and calm.
Consider adding a border: Borders can help your flyer or
newsletter stand out wherever it is placed. Selection of certain colors, Italics and ALL CAPS can draw attention to particular points in a text.
Boost contrast with style, color and font size: Always use
font weight to differentiate sections of text. Many fonts offer regular, bold
and light options for font weight.
Align text for a balanced look: A designer should consider
using a grid system that contains intersecting vertical and horizontal lines
that are often based on optimal proportions for the document’s size. Aligning
text in the center will give a pleasant symmetrical look.
These were later renamed to "Specialized Technology" and "Simscape Components" to help explain this difference.
Specialized Technology (Second Generation) is a Simulink based library and has been around for longer. It can still connect to Simscape, but in the same way you can connect Simulink models to Simscape -- that is, you need converters and sometimes to break algebraic loops, etc. It also has more dedicated electrical power systems capabilities. If your model will be only power systems, and especially if it's a larger model, I'd recommend this one.
Simscape Components (Third Generation) is built using the Simscape language and therefore connects directly with other Simscape blocks. If you plan to use other Simscape domains like mechanical, hydraulic, etc. I'd recommend this one.