A DNA sequencer is a technological device that automates the procedure of DNA sequencing. A DNA sequencer is utilized to identify the sequence of the 4 foundations: G (guanine), C (cytosine), A (adenine), and T (thymine) provided a specimen of DNA (thymine). It is then returned as a reading, which is a textual sequence. Because they evaluate optical signals emanating from fluorophores bound to nucleotides, certain DNA sequences can also be termed optic devices. The Sanger sequencing method, which provided the backbone of the "first generation" of DNA sequencers and allowed the conclusion of the human genome project in 2001, was utilized in the first automatic DNA sequencer, which was created in 1987.