Twitter Developer Apps Think of a Twitter app as a gateway. It provides a set of authentication keys and permission settings needed for making requests to most Twitter APIs. While the majority of Twitter developer products require an API key, not all do. Please refer to the documentation related to the product that you are using to see if you need a Twitter App.
My twitter dev. account application is pending review since more than an year [Twitter Developer Apps] (1)
How to re-apply for twitter developer account after application rejection? [Twitter Developer Apps] (1)
Users unable to create Access Tokens through our WordPress plugin and Twitter App due to account suspension [Twitter Developer Apps] (4)
[Your developer account application was not approved.] How to deal with this? [Developer Portal] (3)