Yes, Samsung Galaxy S23 Plus, S23, and S23 Ultra have NFC which is an acronym for Near Field Communication.
Samsung has always equipped their smartphones with NFC not just the high-end but also the mid-range and even some of their low-end devices.
I believe Samsung will continue to integrate this type of feature into their devices as long as users continue to use digital platforms such as Google Pay and Samsung Pay to make payments online and even at brick-and-mortar stores.
Platforms like Google and Samsung Pay require that your device supports NFC to work on these platforms for contactless payments.
NFC is similar to WiFi and Bluetooth in the sense that they all receive and transfer data/information over radio waves.
But NFC is different in the sense that it operates at a much closer or shorter range compared to Bluetooth and WiFi.
To use NFC, the two devices involved must be within 10 cm or 4 inches of each other. This reduces noise, allows it to separate it from other devices around that have their NFC turned On, and also makes it much more secure.
NFC detection area for most Samsung phones is at the back and that hasn’t changed on the S23 series.
You can easily turn On and Off NFC on your Samsung S23, S23 Plus, and S23 Ultra by going to Settings -> Connections -> NFC and Contactless Payments -> Toggle On and Off based on your preference.
You can then use it to make contactless payments via Samsung Pay or Google Pay. This can be for trains, buses, air traveling, or even at the grocery store.