Every player has a VIP Level that rises by earning VIP Points through various in-game activities (see 'How to increase VIP Level & earn VIP Points'). Higher VIP Level unlocks a wide variety of benefits/perks (detailed per-level in 'List of VIP Buffs & Benefits by VIP Level'). Critically, VIP benefits are NOT automatically passive: to actually receive the VIP buffs at your level, your 'VIP Time' must be enabled/active (consumed via VIP time items — see 'How to get VIP Time'); reaching a VIP level alone does not grant its buffs if VIP Time has expired.
Original research source: Evony Guide Wiki