Web applications are getting more and more complex. Many organisations are struggling to maintain monolithic frontend codebases, and to scale their frontend development processes across multiple teams.
Micro frontends are just one approach to managing that complexity, by splitting products up into smaller, simpler applications that can be delivered all the way to production by independent, autonomous teams.
The pattern has been documented on the ThoughtWorks Tech Radar since late 2016, and has moved steadily from Assess to Trial and finally to Adopt in 2019.