Title search is performed to make sure there are no other unexpected liens and claims than the ones being paid off at closing. Although most title problems, such as unsatisfied mortgages and unpaid taxes can be found through title search, not all title defects are always found.Keep in mind that when refinancing your home, all title liens will need to be paid off. Title needs to be "clear" in order to get your loan financed.
A title search will also show you who is on title to the property. Sometimes, friends, siblings, or other relatives are also listed on title, even thought they don't live in the property. These extra people will normally be required to sign some paperwork at closing.
There are different types of title policies based on loan size. Make sure to ask your mortgage professional if you qualify for all types.
Your mortgage professional works with plenty of title officers that will be able to do the research to find any problems with title.