An account balance in forex refers to the amount of money that a trader has in their trading account after all trades have been settled. The account balance is the sum of all the funds deposited into the account, minus any realized profits or losses from closed trades, plus any unrealized profits or losses from open trades.
For example, if a trader deposits $10,000 into their forex trading account and then opens a trade that earns a profit of $1,000, their account balance will be $11,000. If they then close a trade that results in a loss of $500, their account balance will be reduced to $10,500.
The account balance is an important factor to consider when trading forex because it determines the number of available funds a trader has for future trades. If the account balance falls below the minimum required margin level, the trader may be subject to a margin call, requiring them to deposit additional funds or close some of their open positions.