What is Fluent Wait ?

Fluent wait = Explicit Wait + frequency with which control need to be checked on application +  exceptions to be ignored like 

It defines the maximum amount of time to wait for a condition, as well as the frequency with which to check the condition. Furthermore, the user may configure the wait to ignore specific types of exceptions whilst waiting, such as NoSuchElementExceptions when searching for an element on the page.

Package :- org.openqa.selenium.support.ui.FluentWait

It is mostly used, while working with AJAX applications as well as in scenarios when element load time fluctuating.