Smart film goes by many names; smart tint, privacy film, switchable window film and PDLC film. All of these terms refer to the same technology, a film that is applied to existing glass windows, partitions and doors to transform them into switchable glass that goes from transparent to opaque with the flick of a switch.
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Smart film has a sticky side, making it easy to adhere to glass. The other side has a scratch resistant coating for additional protection. Smart film is typically installed by a window tint professional or glazier, but can also be installed by general contractors or even as a DIY project by two or more handy individuals. The wiring should always be done by a certified electrician.

Privacy film is ideal for situations where the glass cannot be replaced, the glass needs to be thinner than a double pane or the glass area is quite small