# cogent3 Overview¶

cogent3 is a software library for genomic biology. It is a comprehensive framework for manipulation of genomic sequence data and for conducting molecular evolutionary analyses. It is distinguished by many unique built-in capabilities. Of particular note are our non-stationary Markov substitution models. These include non-stationary nucleotide,

and non-stationary codon models. Plus, the ability to manipulate biological sequences by their annotations.