Business consultant is a professional who provides expert advice on the field of securities, management, accountancy, law, human resource, marketing, finance, or many other related business fields.
There are two categories of business consultant.
1)  Internal consultant – someone who operates within an organization. or
2)  External consultant – someone who is employed externally whose expertise is provided on a temporary basis, usually for a fee. They are generally engages with multiple and changing clients. Domestic business consulting and regulation To know the market and other field relating to the business you should consult the expert who might be outsider or insider and focusing on what should be done or how should it be done and follow the regulation that are present in the country.

Types of consultant are:-
1) Management and strategy- If you're looking to expand your markets geographically, extend your product portfolio, reorganize your middle market company to promote efficiency and cost-effectiveness, buy out a smaller competitor, or increase your overall capabilities then need a management & strategy consultant.
2) Operations- this consultant is to know how effective and quality of production processes.
3) Information technology- whether you need to develop a new system or integrate your old systems so that they work together then IT consultant is best.
4) Human resource- do you want to recruit top talent. Then you need HR consultant.
5) Marketing- this are the consultant they analyse your market and get you best ideas related to market. Consultants can be expensive, and you need to carefully weigh the costs and benefits. Only you know the particular needs of your midsized firm. Chances are that a consultant can help turn those needs into highly beneficial solutions.

International business consulting and regulation

Expanding business internationally is bit complex structures with legal entities and reporting obligation in multiple jurisdiction and need financial and assets valuation. Success of your business is really dependence on local regulation and market on how to develop and implement an effective business development plan. consultation usually based on experience and understanding of global markets and regulations, trade finance, global industry analysis, international project administration, relationships with local governments and businesses.