What is a buyer agent?

My sister is planning to buy a new property somewhere in Kentucky. She was confused because someone introduced to her a buyers agent. What is a buyer agent? What is the function of it for a buyer and who usually pays for the service?

the buyer's agent represents the buyer.
A buyers' agent generally has the following duties:

• Assist in finding properties.
• Assist in determining which property is best for you.
• Make and negotiate offers on your behalf.
• Follow through on the contract contingencies until the sale closes