Hi,

Getting a admission in college and getting a seat  are two similar things. The college you get a a seat is where you will get an admission. Since, you are an engineering aspirant, so let us take an example related to that only. You will be appearing for JEE Mains, Now, you apply for JoSAA counselling. You manage to get your name in the list of candidates who got a seat. After this, if you can go further and take the admission at the particular college, where you got the seat.

I hope i was able to explain you.