Consultants are professionals who offer expert advice and solutions to individuals and businesses in their area of expertise, usually on a temporary or contract basis until a particular need has been met. They work with client companies to solve specific business challenges, often in teams, and can focus on a variety of areas, including strategy and technology implementations. Some consultants are independent experts, but many work for consultancies like McKinsey. The day-to-day life of consultants can vary depending on the type of consulting they do and the company they work for. Consultants aim to improve an organizations position or profile by helping to solve problems, manage change, and improve efficiency. Companies hire consultants to get an objective, outsider opinion on processes or systems, solve for internal blind spots, and receive expert guidance on solving a problem. The main reasons that clients hire consultants include improving efficiency, reducing costs, and increasing revenue.