What's downloaded and installed?

What’s the difference between downloaded and installed? Once the app is downloaded from play store it obviously installs, right?? So how’s it differently categorised ?

@SurajSuan04 see https://support.brave.com/hc/en-us/articles/360025284131-What-do-the-referral-metrics-on-my-dashboard-mean-

Oh, got it, thank you.