D4 boosts, short for Diablo 4 boosts, are paid services that help players progress faster in Diablo IV. These boosts are provided by skilled players or professional gaming services and are designed to save time or help with difficult parts of the game. Common types of D4 boosts include power leveling, campaign completion, World Tier unlocks, gear and gold farming, Nightmare Dungeon runs, boss carries (like Uber Lilith), and PvP rank boosts. Boosts can be done in two main ways: self-play, where you play alongside the booster, or piloted, where the booster logs into your account and completes the task for you. While boosts are convenient and time-saving, it's important to use trusted services to avoid risks like account bans or scams.