What does "self-timer" mean?

[Thunu]

English Language Tests, Intermediate level

ESL/EFL Test #159 "Digital cameras, photography and picture vocabulary", question 3

When the ......... is on, pictures are taken ten seconds after the shutter-release button is pressed.

(a) tripod
(b) view finder
(c) power switch
(d) self-timer

English Language Tests, Intermediate level

ESL/EFL Test #159 "Digital cameras, photography and picture vocabulary", answer 3

When the self-timer is on, pictures are taken ten seconds after the shutter-release button is pressed.

Correct answer: (d) self-timer

Your answer was: ?
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Dear Teachers

What does "self-timer" mean?

Thank you
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Reach an agreement as ploughing, don't let argument happen at crops.

[Mister Micawber]

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It is an internal mechanism of the camera which can schedule an automatic photo after a short length of time.
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Native English teacher at Mister Micawber's