‘Nofollow’ tag has been there for long. But now there’s a change in it. There’s nothing to panic though. It will work the same as always until March 1, 2020.
Today rel=“nofollow” works as a directive for Google which instructs the crawler not to follow a certain link tagged specifically with nofollow. However, Google will not take it as an instruction anymore. It means it may choose to respect or ignore this directive from March 2020.