Scrum of Scrums

Scrum of Scrums is one way to coordinate multiple Scrum Teams working together on the same product or goal. It helps manage dependencies, share progress, and solve problems that affect more than one team.
Each team sends a representative to a Scrum of Scrums meeting, where they discuss what's done, what's next, and any blockers impacting others. It's similar to a Daily Scrum---but scaled across teams.
The idea was first described by Jeff Sutherland in 2001 as a way to scale Scrum while staying true to its principles of transparency, inspection, and adaptation.
Scrum of Scrums is one possible approach, not part of the official Scrum Guide. Teams are encouraged to find the coordination method that best fits their context.