An unsecured credit card is just another name for a "regular" credit card. Unsecured means that debt on the card is not backed or secured by collateral.
All the lender has is your promise to pay it back. You usually get higher limits on these types of cards which helps sky rocket your scores over time.
However, be mindful that, unlike secured cards, this is not “capped” because the limit is not determined by you. There’s much less of a spending safety net.