What is telomere in biology?

I know a friend, she set up her name as Telomere in social network apps. Then I wonder what Telomere is? then I find on internet and found this definition:

Telomeres are the caps at the end of each strand of DNA that protect our chromosomes, like the plastic tips at the end of shoelaces

Telomere Biology Gene
Telomere in DNA chain

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