Definition - What does Tantra mean?
Tantra is a set of spiritual practices that direct the universal energies into the practitioner, thereby leading to liberation. Meaning "to weave" in Sanskrit, the term is derived from two words: tanoti, which means "to stretch" or "to expand," and trayati, which means "liberation."
Tantra yoga refers to the Tantric perception of yoga.
Yogapedia explains Tantra
Tantra can be defined as the path that leads to liberation. Contrary to the popular belief in the Western world, tantra does not advocate uninhibited sex. Tantric practices generate sexual energy and purify the energetic body.
As a life-embracing philosophy, tantra consists of various practices, including spirituality, love, sexual union and social life, in order to achieve one's spiritual aspirations.
The "tools" one may use in a Tantric practice include mudras, mantras, prayers, meditation and other yogic practices that purify both the body and soul. Sexual energy is involved in the practices of some Tantrics.
The philosophy of tantra has influenced various faiths, such as Hinduism, Buddhism and Jainism. Tantric rituals expand consciousness and liberate the practitioner from the physical level of existence.