Abbreviation of software release version RC and RTM

ALPHA:
It is an internal test version and is generally not released to the outside. There are many bugs, which are generally used only by testers.
BETA:
It is also a beta version, and new features will be added to the version at this stage. Released after Alpha.
RC :( Release Candidate)
As the name suggests! Used in software is a candidate version. The system platform is a candidate release version. The RC version will not add new features, mainly focusing on debugging.
RTM :( release to manufacture)
The content is the same as that of the official version, but the RTM version also has restrictions and evaluations. HoweverProgramCodeThey are all the same.
OEM:
It is sold to computer manufacturers along with computers, that is, the random version. Only random devices can be shipped, not retail. It can only be completely installed and cannot be upgraded from the old operating system. The packaging is not as elegant as the retail version, and usually only one CD and manual (authorization letter) are available ).