What Causes Light to Behave Differently in the Double-Slit Experiment?

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SUMMARY

The double-slit experiment demonstrates the wave-particle duality of light, where photons exhibit interference patterns when unobserved, indicating wave-like behavior. However, when an observation is made, photons behave as particles, passing through one slit only. This phenomenon highlights the role of measurement in quantum mechanics, fundamentally altering the outcome of the experiment. For a comprehensive understanding, refer to the Wikipedia article on the double-slit experiment.

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I just recently started studying things on the quantum level, I seen an experiment where they shot a beam of light through a hole and it appeared in many places, but when they observed in or something like that. It only beamed through one hole, can someone elaborate more on what that is and what is causing this to happen?
 
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You should probably start with the Wikipedia article about the double-slit experiment, and then ask more specific questions.
 

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