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One of the major discoveries of the Extreme ultraviolet Imaging Telescope(EIT) on SOHO were intensity enhancements propagating over a large fraction ofthe solar surface. The physical origin(s) of the so-called `EIT' waves is stillstrongly debated. They are considered to be either wave (primarily fast-modeMHD waves) or non-wave (pseudo-wave) interpretations. The difficulty inunderstanding the nature of EUV waves lies with the limitations of the EITobservations which have been used almost exclusively for their study. Theirlimitations are largely overcome by the SECCHI/EUVI observations on-board theSTEREO mission. The EUVI telescopes provide high cadence, simultaneousmulti-temperature coverage, and two well-separated viewpoints. We present herethe first detailed analysis of an EUV wave observed by the EUVI disk imagers onDecember 07, 2007 when the STEREO spacecraft separation was $\approx 45^\circ$.Both a small flare and a CME were associated with the wave cadence, and singletemperature and viewpoint coverage. These limitations are largely overcome bythe SECCHI/EUVI observations on-board the STEREO mission. The EUVI telescopesprovide high cadence, simultaneous multi-temperature coverage, and twowell-separated viewpoints. Our findings give significant support for afast-mode interpretation of EUV waves and indicate that they are probablytriggered by the rapid expansion of the loops associated with the CME.

What is the Nature of EUV Waves? First STEREO 3D Observations and Comparison with Theoretical Models