Hsv
In short
HSV stands for Hamburger Sportverein, a professional multi-sport club based in Hamburg, Germany.
In plain words
Most people know them for their football team. They are one of the most famous clubs in Germany, though they have spent recent years fighting to get back into the top league.
A simple example
A fan might wear a blue and white scarf to a match at the Volkenspark stadium to support the team.
Why it matters
The club has a massive history and a huge following. Their performance affects the popularity and competitive balance of German football.
Easy to mix up
Do not confuse them with Hertha BSC, which is another major German club based in Berlin.