Earnest money shows youre serious
Typically when an offer to purchase a house is made, you, as the buyer, will also pay an earnest money deposit.  This deposit shows the seller that youre serious about the offer to purchase the property. 

The amount of earnest money deposit varies based on the type of property being purchased and local market conditions.  As your real estate professional, Ill help you determine the appropriate amount to pay as an earnest money deposit.

The sales contract will dictate who holds the earnest money.  Usually the sellers real estate agent will deposit the earnest money in a trust or escrow account until closing.   At closing, the earnest money is applied to the purchase price.

In the event the sale doesnt close, the sales agreement generally spells out the conditions under which you would forfeit the earnest money.  Generally if the seller meets all the terms of the contract, the seller will keep the earnest money.  If the seller does not meet the terms of the contract, you, as the buyer, may receive a total or partial refund of the earnest money.