ESK is an application that allows users to communicate with their friends through the medium of questions and answers. It has been developed as a tool for people to find out more about the things they are interested in, as well as for those who are looking to make friends. 

It is an SNS (social networking service) app that allows users to communicate with their friends online and offline in the form of questions and answers. The users can ask questions about a variety of topics, such as school, politics, sports, money, and many other things. 

The app allows users to follow other people and get to know them better. It is also an interesting and fun way to make friends.