Realtors do title search to protect the interest of their Buyers as it reveals any easements, right-of-ways and lien on the property as these may affect the value of the property or prevent a Seller from being able to convey a free and clear title to the Buyer. It also allows me to know if I am dealing with the rightful owner of the property.
Easement = An easement is the right to use another person’s land for a stated purpose. It can involve a general or specific portion of the property. (E.g: Power or cable lines running across property)
Right-of-way = A right-of-way is a type of easement that gives someone the right to travel across property owned by another person.
Lien on property = When a lien is registered in the Land Title Office, it becomes a charge against the title to the land or property involved. This lien is paid off before the title becomes free and clear. (Happens when a person builds a house or do massive renovations without full payment of work, the builders can put a lien on the property)