In response to the Black Lives Matter movement, GitHub committed a few months ago to renaming its repository’s default branch name from Master to something with less racist overtones.
The company recently discussed progress in the implementation and announced that Main will replace the Master on October 1, 2020.
GitHub tested the changes internally first, but by October 1, all newly created repositories will be set to main by default, and any new repositories you create will use main as the default branch instead of master.
Existing repositories will continue to have the same standard branch as they do now, but GitHub will offer a tool that will allow seamless renaming by the end of the year.
Although the move can be viewed as reactionary, it is noteworthy that the Drupal project began ditching the term master back in 2014, followed by Python, Chromium and the PostgreSQL and Redis database systems.