«RouterOS versions are released in several "release chains": Long-term, Stable and Beta.
• Beta: Released every few days, only undergoes basic internal testing, should not be used in production
• Stable: Released every few weeks, includes all tested features and fixes
• Long term: Released rarely, and includes only the most important fixes, upgrades within one number branch not add new features. When a Stable release has been out for a while and seems to be stable enough, it gets promoted into the Long Term branch, replacing an older release, which is then moved to Archive. This consecutively adds new features.»