Hiya Pathfinder -
Indeed this is different to building links to your home page or any other as these are inbound links coming in from another site....
Internal links are links which are on your own site which point to pages/posts which are also on your own site....
Building internal links is hugely important as it helps G's crawlers to gain a deeper understanding of your website and how content relates to each other semantically.... Use category, sub categories to tag posts/pages as well as linking out directly to other posts/pages within your site which forms your silo approach... Just look at wikipedia - thats a great example of a site which incorporates a deep level of silo building....
Best of Luck!
Sid