An MBA (Master of Business Administration) is a postgraduate degree focused on business administration. It is a graduate-level business and management degree with a focus on leadership and managerial skills. The core courses in an MBA program cover various areas of business administration such as accounting, applied statistics, human resources, business communication, business ethics, business law, strategic management, business strategy, finance, managerial economics, management, entrepreneurship, marketing, supply-chain management, and operations management in a manner most relevant to management analysis and strategy. MBA programs typically include core classes in accounting, management, finance, marketing, and business law. MBA students may enter their programs from a variety of backgrounds, and there are different types of programs to suit a range of needs. Typically, MBA students enter their programs after gaining a few years of work experience (in nearly any field) and have long-term goals of working in any area of business, and particularly in leadership roles. MBA degrees are not the only type of advanced business degrees. Some students instead pursue a Master of Science (MS) business degree.