The property manager ensures that your investment property is not vacant and finds the right candidate to live in your property.
They will conduct interviews on your behalf and advertise the property when required. They will save you from the hassle of finding the next tenant and managing the property as well.
Many property managers operate on a percentage of your rental income, and some on a fixed-fee basis.
They will also liaise with the tenant and you, as the landlord, should there are maintenance issues in the property.