Not quite everywhere, but almost. To be specific, you can pay wherever Visa is approved. That's quite a lot of places. So you will get along with your everyday life without any problems using our card. The same applies to withdrawals: wherever you see the Visa logo, you can get cash. And that's pretty much every ATM worldwide.
If in doubt, the Visa ATM Finder will show you the way: https://www.visa.com/atmlocator
If you have opened an account before we switched to Visa and are still using a Mastercard, the same applies.
Mastercard also provides you with a finder for ATMs: https://www.mastercard.us/en-us/consumers/get-support/locate-an-atm.html