Using unity's default camera model in my game

Hi, I just started out with Unity and am trying to build my first game following a book, I noticed that the mouse of the game is not locked to the center of the screen initially and you can move the cursor outside of the game view window with the character still looking around. I found this to be a really neat way to control the camera and have an idea how I could use it in my game, unfortunately I’m not exactly sure how to work with this model because all the points on the screen I click on are not really pointed at by the camera’s lookAt vector. Can anyone point me in the right direction, even the name of this model will suffice so I could see how it works. Thanks

Is the game 3rd person?

Or is it kind of like you have a view and your mouse can move around in 3 quarters of the screen but when it reaches the edges it moves the view?