Previously, Twitter Analytics was made available to the celebs and verified account holders only so that they can track their reach and fan engagement.
Now, Twitter has made Twitter Analytics available to everyone. So, now you can see who is reading your Tweets, how many followers are regular and other stats.
Your Twitter account needs to be atleast two weeks old to log into your Twitter Analytics. You can data such as your loyal followers, their gender, locality and other interests.
You can see how many people read tweets and clicked on them. The representation in the form of bar graphs helps in understanding how much engagement you gained or loose than the previous 28-days period. Find your Analytics at https://analytics.twitter.com/
Learn how to use Twitter Analytics to get more details about your fan and engagement.