How is DNA sequenced and what do those long strings of letters mean?

Question

How is DNA sequenced and what do those long strings of letters mean?

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Answer 1

DNA is a loooong chain of chemicals, with repeating sections. Those sections are either Adenine, Thymine, Guanine, or Cytosine. AKA A, T, G, or C. The molecular structure looks a little something [like this.](https://images.app.goo.gl/G6J4oL8uDHFhZ9H4A)

Sequencing DNA just means going through, and essentially “reading” each chemical one by one, so you know the order of those parts.