If a hacker gets your password they may then be able to cause you many problems but with OTP (one-time password) that problem is solved as the password only works one time.

One-time password works by generating a unique password that provides connection security by working just one time (no more problems with people being silly with common passwords), this stops password sniffing attacks dead.

This technology is been around a while but only now is getting a lot of attention because of the ongoing threat from increasingly sophisticated malware, phishing and pharming attacks.

This is not just geeks trying to break in but also organized crime for money who wish to get your passwords.
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