I noticed after I created a custom object, an object which ends with __Tag
has been created as well. What does this object mean?
1 Answer
These objects (tables) are automatically created when tags are enabled in an org and provide the storage mechanism for those tags.
Tags are ad-hoc labels that can be applied to records; they are a way of grouping data.
A good overview article on tags is Salesforce Tags – The Good, The Bad, Limitations, and The Future. This article suggests that Chatter hashtags may eventually replace these tags.
PS "Eventually" has happened - see ca_peterson's comment.
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2By "eventually" I think you mean "in Spring14". Take a look at the release notes and you'll notice tags can't be enabled for new orgs without contacting SFDC, and chatter topics are designed to replace them. Commented Apr 24, 2014 at 21:11