A tag management system is a solution offered by dedicated vendors to manage the "third party tags headache" associated with the multiplication of third party tags on website.
Benefits associated with a tag management system are :
saving labor cost related to tag implementation
reducing implementation delays
accelerating loading times
privacy management optimization
potential additionnal service of attribution modeling
TMS are based upon the use of an unique universal / container tag on the website associated with a central console managing all third party tags.
For more details and illustrations about tag management services see tag management.