The VSTOXX Indices are based on EURO STOXX 50 realtime options prices and are
designed to reflect the market expectations of near-term up to long-term
volatility by measuring the square root of the implied variance across all
options of a given time to expiration.
The VSTOXX Indices are part of a consistent family of volatility indices:
VSTOXX based on the EURO STOXX 50; VDAX-NEW based on the DAX; and VSMI
based on the SMI.