Tantra is removing the perceived veils of seperation between the individual and the Devi (Goddess), the individual and the world and the individual and all others in the world. It is the experience that all of the above are one. Not the theorectic understanding, but the actual experience.
Sri Vidya is the only school of Tantra that is both Vedic and Tantric. It is devotted to the worship of the Goddess as TripuraSundari. It is Advaitik, meaning that ultimatly the Goddess we worship is not other than ourself and the practices of Sri Vidya are designed to remove this perceived veil of seperation allowing us to realize our own divine nature and the divinity in those around us as well.