What is difference between marketable title and insurable title?

A title examination that shows no title defects or other encumbrances, and, title to be in the seller is acceptable evidence of marketable title.

this means there are problems with a title preventing it from being marketable to add additional proof of ownership negating those problems would cure the problem

To determine the owner of the property, the liens on the property and the judgments against the owners that may attach to the property. It is done to assure the buyer and/or the lender that the title is clear and marketable.

list the names of marketable securities used in pakistan