Health Card / National Services Card
Plain English
It's a version of the tessera sanitaria that also works as a Carta Nazionale dei Servizi: a digital identity card with a chip. With a reader and a PIN, you can use it to log into public services like SPID does.
Why it matters
If you don\'t want SPID and your CIE isn\'t ready yet, the TS-CNS can be your digital identity tool. Many regions issue it by default.
Common confusion
The chip needs to be activated at your ASL and you need a reader (or a smartphone with NFC and the right app). Without activation, the card is just a normal tessera sanitaria.
Official source
Sistema Tessera Sanitaria