Why does the secure text entry window appear?

secure-text

When I'm on the Internet, a window appears asking me to enter a secure character.

They want you to enter a number that is hard to recognize or English, but

Why do you ask me to enter it?

989 2016-04-26 Gentleman

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A. 1

Because I want to distinguish between people and computers.

Gentleman 9 years ago 0

A. 2

It's usually used at the place where you sign up.
The reason for using secure text is that if you don't do that, the automatic program will create an account recklessly.