Simple definition
VMware Tools supplies guest drivers and integration services for improved VM management and performance.
Purpose and use
VMware Tools supplies drivers and integration services between a guest OS and the VMware platform.
How does it work?
Components can improve device handling, state reporting and selected guest-coordinated operations.
Example and verification
Check version, service health and capabilities required by the OS and backup scenario.
Points to watch
Installation does not prove that every component works or that a backup is application-consistent.
In short
Validate integration features for their intended use rather than relying only on installed status.