Corporate law firms specialize in corporate law and serve as legal representatives for corporations and large businesses. These firms practice in a wide variety of legal fields, including contract law, tax law, real estate, mergers and acquisitions, and bankruptcy. Corporate attorneys typically spend more time negotiating contracts with private parties than litigating in court, but businesses can work with these law firms when any legal matters arise. Larger businesses may employ in-house attorneys and only require the services of corporate law firms in special circumstances. A number of corporate law firms offer intellectual property litigation, which can aid clients in defending matters such as copyright or patent infringement. Corporate law firms use a variety of legal software products to manage their practice, conduct research, and track client information.