What is the point of having stars when we can already make our own labels? Aren't stars just another label? It would be interesting to see a use case where using stars is preferable to using labels.
Gmail – Difference Between Stars and Labels
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Best Answer
You could consider stars to be another label; you have flexibility in how to use them. Stars are, however, treated a bit differently than labels.
For instance, there is a search operator for stars:
is:starred. For labels the syntax is a bit different:in:labelname.Stars also have special meaning if you use Priority Inbox. It's one of the signals you can use for the different buckets, such "Important and Starred" or "Starred and Unread".
Stars also have a special hook in the API. I use IFTTT to add an entry to my todo.txt file whenever I "star" a message. This isn't so easy with labels.
Not to mention starred messages can be set to automatically appear on the "Primary" tab (as Vidar points out).
It seems that most people use labels to organize their messages, while they use stars to keep track of messages they want to find quickly, perhaps as a sort of task list.
All that said, if you have no use for stars, there's no reason you have to use them.