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If you have a VISA check card then when used overseas it uses the credit card network.
These cards typically have:
You can do all transactions abroad (as long as you have CHIP+PIN enabled***), which include point-of-sale transactions, ATM cash withdrawals and balance inquiry (but nothing else, for example, you can't change your PIN at an ATM), and use them at kiosks if supported.
*** - some banks require online PIN verification and these cards do not work on many automated kiosks, and (very rarely) on point-of-sale terminals. Check with your bank and ensure card has online and offline PIN verification enabled. You may also have to inform your bank that you are traveling in order to enable the card for international transactions; further you may want to (at least once) use the card at a bank-owned ATM; as sometimes this is required to enable all the features and really "activate" the card.
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USA issued Visa /MasterCard debit cards / check cards, as well as USA issued credit cards are almost exclusively chip & signature cards. Some banks issue a chip & pin credit card for their business customers that travel abroad, but these are the rare exception not the rule.
Your debit / check card comes with a PIN, but that PIN is for use in ATMs and USA based pin-debit systems (such as what your local grocery store has). It will not work in foreign pin based debit systems.
When you travel overseas, your debit / check card should be used as a credit card not debit card. This determination is normally automatic by the system, but occasionally a clerk will ask you "debit or credit" and you should always choose credit.
Your debit / check card will work in 95%+ of card terminals around the world, be they swipe, chip & signature or chip & pin. Some notable exceptions to this are automated bus / tram ticket kiosks in Europe, where for some reason the designers did not consider that foreigners might be using them and set them up to work exclusively with European style chip & pin cards. But I have found that you can usually find someone willing to take your cash and buy a ticket for you with their card, so no need to stress about it.
So yes, your chip & signature debit / check card will work in most situations outside the USA, but No, it can not be converted to a chip & pin, it will always operate as a chip & signature.