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Molecular Immobilization, more commonly referred to as freezing, is the ability to slow down molecules to the point where they move so slowly that objects and people appear completely motionless, simulating the stoppage of time in a localized range.
This is Piper Halliwell's primary power, which she originally triggered by panicking or being scared, flicking her hands into the air and "freezing" her target.
Kyra was a demonicseer who turned her back on the Underworld with the intention of one day becoming human. When the Avatars were still an unknown threat, she offered her information to The Elders in return for being made human.
It was hinted that, at one point, Kyra had some form of relationship with the demon Zankou, who vanquished her later on for betraying him.