A plain-language explanation
A tag is a tag or label used to describe, group, or technically mark content and data.
Where it helps in practice
A tag may mean a content label, tracking snippet or HTML element, so context is essential.
The decision before implementation
Name the system and purpose first, then define naming, ownership and effects on structure, data or performance.
How to verify the result
Check duplicates, unused labels, script firing and whether documentation matches production; retire obsolete tags through a documented change process.