Hi @Pratyush Sharma and sorry for late answer.
Some of the websites (most are financial services like banks) use masked password entry on login. It means you have to enter only some of the password signs, e.g. first, third and the last.
If you password is 12345qwerty (hope it's not ) and you get this input:
then you have to enter: 1,2,4 and y.
Which password sign you need to enter is randomize by the bank on each login.
Supporting this by Enpass means recognize which fields need to be filled with corresponding sign from stored password and autofill.
I hope it's now more clear to you.