Good afternoon, Mohmmad. Do FBAR and its legalities apply to specific set of accounts and if yes, what type of accounts they are?

There are several accounts to which FBAR applies to.

Few to mention over here are:

Checking, savings, securities, brokerage, deposit, or any other account held with a financial institution.

Moreover, if you hold a position of signature authority, you may also need to file for FBAR.