So you can use them. Otherwise they are nothing but peices of plastic.
That's what the card scanner 'reads'. It contains the bank's identification and your account number, etc.
Why do credit cards have a magnetic stripe on the back
A magnetic stripe reader is used to read the information stored on the magnetic stripe on the back of cards like credit cards, entertainment cards, bank cards, and other similar cards. The magnetic stripe contains data such as account number and expiration date, which is swiped through the reader to facilitate transactions.
magstripe reader
no one knows why they just r sorry 4 the lame answer but i can't find it anywhere
The ­stripe on the back of a credit card is a magnetic stripe, often called a magstripe. The magstripe can be "written" because the tiny bar magnets can be magnetized in either a north or south pole direction.
The magnetic strips on the back of bank cards and credit cards can be affected by strong magnetic fields or being close to weak magnetic fields. When you keep credits cards in a wallet with magnetic strip touching or being very close together, it is possible for the magnetic strips to affect each making them unreadable. Even so, the credit cards can still be used by manually keying in the credit card number.
The strip on the back of a credit card is made up of a lot of magnetic particles which identifies and contains account information.
A card skimmer reads the back of credit and debit cards. It is a type of device employed to commit credit card fraud and identity theft.
Magnetic Storage:Hard disk drive (HDD)Floppy disk drive (FDD)Data Tape backupMiniDV tapeCassette tapeThe magnetic stripe on the back of a credit or debit cardNon-magnetic Storage:Solid-state drive (SSD)Flash memory cardUSB flash driveOptical media (DVD, CD and BluRay)Punch cards
So you can use them. Otherwise they are nothing but peices of plastic. That's what the card scanner 'reads'. It contains the bank's identification and your account number, etc.
The security codes on most credit cards is the three digit number that is on the back, after the black stripe ends on the right side. I am sure Mastercard is the same.
"In today's modern world of technology, magnetic encoding has revolutionized the safe and reliable transfer of personal credit card data. However, once the magnetic strip has been damaged on the back of a credit card it will no longer work properly. The only solution is to replace it with a new card."