What does first-touch contribution in Google Analytics mean?

First-Touch Attribution is the first channel that introduces your brand to the customer. It is your first shot at attracting customers and leaving an impact on their minds. For example, you want to purchase a new jacket as winter is just around the corner. You search for jackets on Google and click on one of the results. Now how did you make your first interaction with that website — organic search, is the First-Touch Attribution.