Un consultor (del latín consultus que significa "asesoramiento") es un profesional que provee de consejo experto en un dominio particular o área de experiencia, sea mantenimiento, contabilidad, tecnología, publicidad, legislación, diseño, recursos humanos, ventas, arte, medicina, finanzas, relaciones públicas, comunicación, aprendizaje de lenguas extranjeras u otros. La principal función de un consultor es asesorar en las cuestiones sobre las que posee un conocimiento especializado. Los consultores también poseen una especialización dentro de su actividad, ejemplo de esto es un consultor contable, con un nivel de especialización mayor en los aspectos relacionados con la contabilidad o economía en una empresa a diferencia de un consultor comercial, que a veces pueden poseer un conocimiento general pero no necesariamente profundo en algunas áreas.

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A consultant (from Latin: consultare "to discuss") is a professional who provides expert advice in a particular area such as security (electronic or physical), management, education, accountancy, law, human resources, marketing (and public relations), finance, engineering, science or any of many other specialized fields. A consultant is usually an expert or an experienced professional in a specific field and has a wide knowledge of the subject matter. The role of consultant outside the medical sphere (where the term is used specifically for a grade of doctor) can fall under one of two general categories: \n* Internal consultant - someone who operates within an organization but is available to be consulted on areas of his specialization by other departments or individuals (acting as clients); or \n* External consultant - someone who is employed externally to the client (either by a consulting firm or some other agency) whose expertise is provided on a temporary basis, usually for a fee. Consulting firms range in size from sole proprietorships consisting of a single consultant, small businesses consisting of a small number of consultants, to mid- to large consulting firms, which in some cases are multinational corporations. This type of consultant generally engages with multiple and changing clients, which are typically companies, non-profit organizations, or governments. By hiring a consultant, clients have access to deeper levels of expertise than would be financially feasible for them to retain in-house on a long-term basis. As well, clients can control their expenditures on consulting services by only purchasing as much services from the outside consultant as desired. Consultants provide their advice to their clients in a variety of forms. Reports and presentations are often used. However, in some specialized fields, the consultant may develop customized software or other products for the client. Depending on the nature of the consulting services and the wishes of the client, the advice from the consultant may be made public, by placing the report or presentation online, or the advice may be kept confidential, and only given to the senior executives of the organization paying for the consulting services.

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