12th Nov 2019: Microsoft started rolling out the free Windows 10 November 2019 Update. For those keeping track, this update is Windows 10 build 18363 and will bring Windows 10 to version 1909. You can grab it from Windows Update when it’s served to you, or try to download it manually (when available in your region).
Windows 10 is being developed as a service, meaning it receives new features on a regular basis. Microsoft has released seven major updates so far: November Update, Anniversary Update, Creators Update, Fall Creators Update, April 2018 Update, October 2018 Update, and May 2019 Update. The eighth one arrives this month.
Update - PM 15/11/2019: I have updated my laptop to Win10Pro v1909 - a really fast upgrade: 5-10 mins including download, install & reboot! No visible differences - some minor changes.