Two factor authentication is the neat technique of adding extra security by requiring two different types of verification. So, rather than ask you to provide two passwords — both things you could remember or find written down — if you are asked to provide a password and a code you could only have if you had a particular device, security is greatly enhanced.
The usual factors involved include asking for two from:
Hence the convenience of photo ID where you have to provide the ID and also look like the photo. Or provide a ticket and a code, or a chip and pin…
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