Key logger:
Keystroke logging (often called keylogging) is the practice of tracking (or logging) the keys struck on a keyboard, typically in a covert manner so that the person using the keyboard is unaware that their actions are being monitored. There are numerous keylogging methods, ranging from hardware and software-based to electromagnetic and acoustic analysis.
If someone installs the keylogger software on the system you are browsing they can get the processing that you have dne on the keyboard as mail for them they can trap your username and passwords and access your account.
once happened that internet owner did the same thing and hacked an hdfc bank accout opened by the customer in his internet shop and drawn the money from it about 10,000rs and the customer did not understood and gave a complaint to the police and the internet shop owner had caught after investigation.
Hence be protected from this software by using on-screen keyboard you can protect your self from keylogger software when you are typing passwords etc..
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