A collection is an editable group of Tweets hand-selected by a Twitter user or programmatically managed via collection APIs. Each collection is public and has its own page on twitter.com, making it easy to share and embed in your website and apps.
Create and edit a collection using TweetDeck
TweetDeck supports adding Tweets to a collection by simply dragging a Tweet into a collection column.
View a collection on Twitter.com
Each collection has a public URL on Twitter.com. Share a collection with others by including it in a Tweet, email, or other share method.
Embed a collection in your website or app