It’s a rare occurrence for the Windows Insider program to get two new builds on the same day, though the last time this happened was only a month ago. That’s because Microsoft is developing two updates of Windows 10 at once. The first build is part of the RS4 branch, which represents the next Windows 10 update the company has yet to announce (but is expected to ship in April), and the second build is from the RS5 branch, which represents the Windows 10 update that will arrive much later this year.
Windows 10 is a service, meaning it was built in a very different way from its predecessors so it can be regularly updated with not just fixes, but new features, too. Microsoft has released four major updates so far: November Update, Anniversary Update, Creators Update, and Fall Creators Update.
