Block Patterns are collection of single blocks combined into a section. The terminology is fluid right now, though and the API is going to be more refined in Gutenberg plugin 7.6.
The future of website creation is here.
With Genesis and Atomic blocks, you can build beautiful, powerful websites in minutes with our robust theme framework and professionally-designed sections and layouts
This new Gutenberg thing is enough to tie myself to a space shuttle and just launch myself out of the planet forever.