The Ubuntu release cycle
LTS Desktop and Server
Long Term Support releases for desktop and server. There are deployment platforms with wide hardware and software support and ideal or individuals and businesses making a longer term investment in Ubuntu
These are the 6 monthly release that contain the best of the new from the Open Source and commercial worlds and suited to users happy to upgrade regularly.
These are 6 monthly updates to the long term support cycle. These are primarily bug fixes and patches with occasional feature enhancements that maintain the integrity of the release over a long cycle. The point releases continue up to the next LTS release which then offers an obvious upgrade path for users
This is the extended support period for server.