This is a very popular and well known type of whisk. It is quite likely you have one (or many) in your kitchen as you read this.
The reason that the french whisk is popular is because it functions as a general purpose whisk that does the job well.
The two most common whisks in use are called the "Balloon" and the "French". This page is about the French whisk. Comparing them is a great way to illustrate what a french whisk is and how it differs from the other popular whisk.
Note the narrow skinny profile of the french whisk and the wide round profile of the balloon whisk.
The skinniness or long slim profile of this tool is useful for reaching the corners and edges of the pan / or container you are using. the stright profile means it is more useful when scraping the sides of a container as well.
While all French whisks share a similar shape, there are many different sizes and materials used.
This is the tool we featured on this page. All the images in the above article are of this utensil. This is the standard 11 inch French whisk by Oxo they also offer a 9 inch version.