A Faraday bag is a type of enclosure that blocks electromagnetic fields, much like a Faraday cage. It is named after Michael Faraday, who invented the Faraday cage in 1836. Faraday bags are made of conductive metallic fabric that blocks signals from reaching whatever is inside. They are used to shield electronic devices from outside signals, preventing data from being altered, deleted, or added to a device. Faraday bags are commonly used to protect sensitive electronic equipment, such as RF receivers, from external radio frequency interference (RFI) during testing or alignment of the device. They are also used in digital forensics to prevent remote wiping and alteration of criminal digital evidence. Faraday bags can be made up of a wide range of materials, but the most common are multiple layers of various metallic layers, such as copper, aluminum, and static dissipative polyethylene. They are often used to protect keyless car fobs from outsider hackers who aim to tap into the transmitter signal to steal cars. Faraday bags are an affordable, one-time investment for the protection of your data in the past, present, and future. They are effective, but they can be compromised if the bag develops holes or the material wears out.