The real estate agent gives professional, administrative and personal support.
Professional support means explaining the market to you, advising you on prices and other requirements, showing their inventory, arranging to promote your property (if you are selling) or viewings (if you are buying), negotiating and handling various practical matters.
Administrative support means handling the paperwork, answering your emails, messages and calls, arranging meetings, etc.
Personal support involves giving you support and advice during times of stress and, on the happy side, celebrating with you when things go right.