Congratulations and good luck on the purchase of your first home.
An escrow account is a means by which a broker deposit money associated with a specific transaction in an account that is separate from their personal money.
When you have found a home that you wish to place an offer on, it is customary to place a deposit with your purchase offer. This is normally an unspecified amount that demonstrates to the seller that you are a serious buyer. Obviously, the larger the amount you put on the table the better your offer appear to the buyer.
In some cases, when a deposit is a lesser amount, the seller may counter and request that you provide additional money in order to be considered. In short, "escrow" is not a cost but an amount of money determined by both the buyer and seller that is acceptable as a deposit or evidence of "good faith."
Your real estate frofessional will be able to provide you with additional information.