Account to account: transfer tokens from account to account.
Force amount from admin: Use Sudo - superuser account or Council to set an account with a certain balance. For example, we have an account with balance = 1000. Sudo or Council uses the admin right to force balance up to 2000.
Transaction pool: The pool to store all transaction requests (sign and unsign transactions). These transactions in the pool are calculated to push in Queue to process and store in blockchain.