This time of year, many applicants get something informally called the "likely letter" from some of the schools that they applied to. This is where the college sends a letter saying that they're very excited about the applicant, and will be getting back to the applicant in about a month, but that they are excited about the student joining their college. This is not an acceptance letter, this is purely a letter that says that the student may get in.
As a counselor for over 10 years now, I am alarmed at this practice increasing. I have had students in the past who have received this letter and then not actually been admitted. I do not think that it is fair that universities send this kind of letter to Students. What good can it do? This is already a very anxious time for students waiting to hear from universities. Presumably, the university has already read the application, so why not just decide and send the letter of acceptance early. This practice also scares students who have not received the likely letter. They are all talking to each other on college confidential or some Facebook group. What doesn't mean you have not received this likely letter? Actually, it doesn't mean anything, but try to tell that to the student who is anxiously waiting to hear back from colleges and keep hearing about the other students are receiving these letters.
Don't make this process have even more anxiety than it already has.