In bioinformatics, FASTA format is a text-based format for representing either nucleotide sequences or peptide sequences, in which nucleotides or amino acids are represented using single-letter codes. The format also allows for sequence names and comments to precede the sequences. The format originates from the FASTA software package, but has now become a standard in the field of bioinformatics.
The simplicity of FASTA format makes it easy to manipulate and parse sequences using text-processing tools and scripting languages like Python, Ruby, and Perl.