First of all this app is created by government of INDIA for prevention of COVID-19, You will know all about this app after reading this post.
Aarogya Setu app will take your some common information like your name, age etc and send it to government server, its not like that government will use your data for other purpose, You will get notification when you are in contact of any doubted COVID-19 person who have Aarogya Setu App.
How it works?
It takes your given data and send it to government server, if other persons came in contact with you and if he have same app as you then app computerise the data and differentiate the data of yours and his/her data then alert you if there is any COVID-19 doubt in persons profile.
Is it important to install this app?
Yeah, it is very important to install this app, the more you spread this app the more it will be helpful for others and government to fight against corona virus. You can easily install this app from Play store or app store