Can anyone tell daemon thread in simple words with an example

can anyone tell Daemon thread in simple words (i don't understand high level language)with an example

He reminds me of a candidate I had the ... priviledge? ... of interviewing for a web developer position not too long ago. I asked him to "reverse the characters in a string, i.e. star = rats" using his language of choice. He stands, walks to the white-board and starts to write some stuff. At that time, I turned to my boss and we start making comments to each other about the guys resume and discussing some of our current workload, giving him time to work this code out on the board. A few minutes (5 - 10) go by and I glance up to see that he has written a single line of code (and that his hands are covered in dry erase marker from having scrubbed multiple attempts off the board). His code (I believe it as a stab at either php or javascript) read:
"reverse_string('star');"
I looked at my boss, he looked at me ... we both blinked a couple of times and then I explained, "no - I need you to implement the reverse_string method. I want you to write the code that does the actual reversing."
"Oh. Yeah, I can't do that."

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