Letter of interests

So I just got a letter from Princeton office admission “inviting me to consider Princeton”. I have high gpa, 4.3, as a junior but low sat, 1780, because I got a 460 on critical reading. I’m just wondering does this letter mean anything? And why me? Is it just any random letter sending trying to get more applicants so they can reject more or is there something about me they want or are interested in?