Tag
Tags use text (keywords or terms) to label card and sticky note items.
Tags help classify and categorize information to make its retrieval easier.
You can assign tags a text label and a color.
When you create a tag, it is added to the current board, and it is available to all supported items on the board.
After creating a tag on a board, you can attach it to the following board items:
ℹ️ Note:
- (Web SDK and REST API) Card and sticky note items can have up to 8 tags.
- (Web SDK) Boards can have up to 100 tags in total, when tags are added either manually through the board UI, or programmatically with the Web SDK.
A tag attached to a sticky note:

Figure 1. A tag attached to a sticky note.
See also
Updated 27 days ago
What's next
To discover the REST API and the Web SDK feature sets and to get app ideas, check their tutorial sections.