Tampering is a form of falsifying, which is the act of deliberately misrepresenting or altering something in order to deceive. Tampering involves making changes to an object or document in order to change its meaning or outcome. It can be done with physical objects, such as tampering with a car's odometer to make it appear to have fewer miles than it actually does, or with documents, such as changing the date on a contract. Tampering is illegal and can lead to serious consequences.