If you travel frequently, you're probably relying on public Wi-Fi hotspots often. While they are convenient, you should be aware that some of the things you do while connected to that hotspot could be visible to others. Many of the tasks that people do online, including banking, Amazon, Facebook, and most email providers, are already encrypted using https. This means that everything on that connection is secure. You can find out if you're on an encrypted connection by checking the URL in the navigation bar. If it's encrypted, you'll see "https://" instead of just "http://" in front of the site address.
If you're doing something that isn't already encrypted, you may want to get something to keep your data secure. The easiest way to do this is with the Tiny Hardware Firewall VPN Client. This is a small device that doesn't require any software to download, install, or configure and it can be powered by anything with a USB port.