Ergonomics is the field of study focused on individuals and how they interact with their occupations, workplace, systems, and products. Also known as human factors research ergonomics is frequently a subfield within Industrial and Organizational (I/O) psychology. In ergonomics emphasis is placed on efficiency and how well individuals interact and perform within their workplace and with systems and products.
For example, an ergonomical workstation would be designed with the person using it in mind - the placement of the items that are used would be comfortable, efficient, functional, and safe for the individual using it. Many products are ergonomically designed in that they are made with efficiency and individual comfort in mind.