Final answer:
Redshift in light indicates motion of galaxies away or towards us based on Doppler effect.
Explanation:
Redshift refers to the change in light (to a lower frequency) emitted by neighboring galaxies due to their motion away from us. This shift in wavelength, leading to a longer wavelength and lower frequency, is a result of the Doppler effect.
For instance, if a galaxy's light waves are observed as redshifted, it indicates the galaxy is moving away from us. On the other hand, a blueshift would indicate that the galaxy is moving towards us, resulting in a shorter wavelength and higher frequency of light.
Learn more about Doppler effect in astronomy here:
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