Values from a mapped column (source column) will be merged as links.
Title is the text displayed in Gmail message, link is where it points.
Use Link as Title
Values from a source column will be inserted into Gmail message as links and titles will be the same as links. For example for value https://anymerge.com Gmail message will contain link http://anymerge.com. What is in the cell will be in a Gmail message.
Get TITLE from a column
Values from a source column will be inserted into Gmail message as links and titles will be taken from another column.
For example you have a value in a source column https://yourwebpage.com/download/invoice/invoice-2020121245.pdf. Then you have another column where you would like to take titles from and there is value "Invoice 2020121245". Gmail message will contain link Invoice 2020121245 pointing to https://yourwebpage.com/download/invoice/invoice-2020121245.pdf URL.
Use this option when you want display personalized titles for recipients - each recipient receives different link with different title.
Values from a source column will be inserted into Gmail message as links and all will have the same title. For example you want to send to each recipient different link but all will have title "Download Invoice".