Translation companies are organizations which market translation services. They may have the work done by staff translators or, more commonly, by subcontracting with individual translators whom they have located and checked.
Translation companies are usually focused on, and good at, both sales and marketing and internal production. But in addition to these core tasks, translation companies spend a significant amount of time in locating and qualifying external translators, checking their availability, negotiating prices, exchanging paperwork and making payments.
ProZ.com frees translation companies up to focus on sales and production by providing tools that assist them in locating, qualifying and working with independent translators.