Pichia pastoris is a species of yeast commonly used in biotechnology for protein production. It is favored for its ability to grow rapidly and efficiently on simple carbon sources, making it cost-effective for large-scale fermentation processes. This yeast can perform post-translational modifications similar to those in higher eukaryotes, which is essential for producing functional proteins. Researchers often use Pichia pastoris to express recombinant proteins, including enzymes and antibodies. Its well-characterized genetics and ability to be genetically manipulated allow scientists to optimize protein yield and activity. This makes it a valuable tool in pharmaceuticals, research, and industrial applications.