A software keylogger is a program that can record each stroke on the keyboard that the user makes, most often without their knowledge. The software has to be downloaded manually on the victim's computer. It will automatically start capturing keystrokes as soon as the computer is turned on and remain undetected in the background. The software can be programmed to send you a summary of all the keystrokes via email.
CNET has Free Keylogger, which as the title suggests, is free. If this isn't what you're looking for, you can search for other free keyloggers or pay for one.
Hardware Keylogger
These work the same way as the software keylogger, except that a USB drive with the software needs to be connected to the victim's computer. The USB drive will save a summary of the keystrokes, so it's as simple as plugging it to your own computer and extracting the data. You can look through Keelog for prices, but it's bit higher than buying the software since you have the buy the USB drive with the program already on it.
How to Protect Yourself
Use a firewall. Keyloggers usually send information through the internet, so a firewall will monitor your computer's online activity and sniff out anything suspicious.
Install a password manager. Keyloggers can't steal what you don't type. Password mangers automatically fill out important forms without you having to type anything in.
Update your software. Once a company knows of any exploits in their software, they work on an update. Stay behind and you could be susceptible.
Change passwords. If you still don't feel protected, you can change your password bi-weekly. It may seem drastic, but it renders any information a hacker stole useless.
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