AWS Organizations
AWS Organizations centralizes governance across multiple AWS accounts, letting you consolidate billing and apply consistent policies. It handles account creation and resource grouping, making it essential for maintaining order in large, multi-account environments without adding complexity to your daily operations.
This fits teams managing numerous accounts who need unified control. Since it is always free, there is no cost barrier to adoption. However, it strictly manages organizational structure rather than providing deep application-level monitoring, so you still need other tools for granular performance tracking.