This is a Discord Lookup Tool.
You copy someone's Discord ID, and paste. It will give you info about the user, such as profile icon, username, banner, join date, etc.
To get someone's Discord ID, go to Settings > Advanced > Developer Mode. Turn developer mode on. Next, go to the user you want to lookup and left click on their profile. At the bottom, it should show the option "Copy ID". Copy the ID and paste it on to the lookup. The lookup will show the account data of the ID you pasted.