Visitor flow or the user flow analysis helps you understand the next level of interactions of your users coming from various source or medium on your website.
To do the same, you will need to click on ‘Audience’ option in the left hand navigation of the Google Analytics tool & then click on ‘User Flow’
The beauty is that you can select your user base from various options available as below(in the image): To cite some examples: you can select users coming from a certain country, city, social media, search & more..
You can also customize your options using the below capability:
Go ahead & use this beautiful feature in Google Analytics which shall help you analyze your users better and help you optimize your webpages (& website).