Cryptocurrency will affect traditional banking in a number of ways, but the most significant effect is that it will change how we store our money.
For instance, instead of going to a bank teller and withdrawing some cash, you might just send a few clicks over the internet. Cryptocurrency is also much more secure than traditional banks because it uses encryption technology. This means that even if someone hacks into your account, they still can't access any of your funds.
The second major way cryptocurrency will impact traditional banking is by changing how we make payments online. For example, if you're paying for something online right now, it's probably through PayPal or another service like it (like Venmo). Cryptocurrency could replace these services altogether, and probably before too long.