2FA stands for two-factor authentication, but also goes by dual-factor authentication. 2FA is a staple for account security. It is especially important for cryptocurrency exchanges and trading platforms since it acts as a second layer of account protection from theft and takeovers.
There are a variety of 2FA methods, but hardware tokens and applications like Authy rank among the most secure. You can choose between Authy 2FA and SMS 2FA on Newton.