"Kills" is a stat which refers to the number of players you have killed during a match in Fortnite: Battle Royale.
The stat is indicated next to a skull icon under the Mini-map (see screenshot)
The more kills you get, the more XP you get awarded for the match.
- You can win the game without any kills, for example if you survived until the last moment and the sole other surviving player dies to the Storm.
- There are several Daily Challenges that require you to eliminate a certain number of enemy players.