Once you enter your details and install the official AirDroid app on your Android (also available on Uptodown), you can access all the different sections of the program. It's possible to send all kinds of files and even create folders from Windows that will sync remotely. You can also access your entire text message history along with your call log and your contacts list, as well.
One of the more interesting options is the AirMirror service, which will broadcast a sort of mirror image where you can see the screen of your Android and even interact with it via the mouse. This, along with other practical uses, like receiving all your notifications from the notification bar on your Windows desktop, makes AirDroid an especially useful tool.