[Plugin: Contact Form 7] require code for contact

i am pretty new to wordpress but learning.
i downloaded the contact form 7 plugin, activated it OK and inserted the code into the Contact Us page that i had created.
it looks correct!
Question: there is nowhere for the user to enter a code sequence of letters to confirm that he/she is a real person. i believe that without this, a “bot” could start sending me email. Is this not true?

Do you agree with the above and if so, how can i add this to the form so that the plugin provides this?
Thank you…………