Vf
In short
Vf is the abbreviation for Verein für, a German phrase meaning Association for. It is commonly used as a prefix in the names of many German sports clubs.
In plain words
In Germany, many clubs use this term to show they are a formal group dedicated to a specific activity. It is usually followed by the name of the sport or the town.
A simple example
VfL Wolfsburg stands for Verein für Leibesübungen Wolfsburg, which means Association for Physical Exercise Wolfsburg.
Why it matters
It helps identify the legal and social structure of a club. Without these prefixes, many famous European football teams would have much shorter, less formal names.
Easy to mix up
Do not confuse it with FC, which stands for Football Club and focuses specifically on the sport rather than general physical exercise.