Do you remember the last time you visited a market? Maybe yesterday you went to buy some fruit or some bread. A market is a place where you can buy products or pay for certain professional services.
In the market you have also found different people selling products, offering different and/or similar products or others offering exclusive products. The prices are diverse and the people who have gone to buy a product can decide to buy from the varied offer of the market. Markets can be small local daily or weekly markets, or large markets celebrated at designated times.
Source: Illustrator: Clare Owen for Cooking light magazine
All these characteristics and some others are the same that will help us to define what the market is for an entrepreneur.
In a formal definition: Market is an actual or nominal place where forces of demand and supply operate, and where buyers and sellers interact (directly or through intermediaries) to trade goods, services, or contracts or instruments, for money or barter.
When you are an entrepreneur and launch your project, it is important to know what your market is: where you are going to sell your products, how you are going to sell your products, at what price you are going to sell and to whom you are going to sell. In addition, it is important that you know who is selling the same product as you and how to differentiate yourself from them so that your products or services are exclusive and can compete better.
 In BusinessDictionary.com http://www.businessdictionary.com/definition/market.html