If you are wondering what airdroid is actually.Then in short it is an app which provide remote access to your other device.Still if don’t get it what it is actually then you should see some vidoes on youtube
Now It is very usefull app .People are using it for get in someones phone without touching his phone .yes you hear this right.You can see all media and files of another mobile without letting him know all you need to install the app in thr victims phone and give authorisation from there and sign in from yout id in his app.then open this app Website website you have to open and log in with same id , and now you can access his content.very useful
Parents use it to keep eye on their childern.
Male use to keep eye on thier girl friends.
DISCLAIMER: ABOVE INFORMATION IS JUST FOR KNOWLEDGE PURPOSE I DO NOT ENCOURAGE YOU TO HACK SOME ONES PHONE TO GET IN HIS PERSONAL LIFE