Small and Medium Enterprise, usually the abbreviation SME is used. Sometimes the abbreviation SMB (SMBs) for Small and Medium Businesses is used. This is a category of companies specified by the number of employees and revenues. Conditions in each country differ, so in each state the category of SMEs include different companies.
SME in practice: In the European Union, the category of SMEs companies are described as: from 10 to 250 employees with revenues (turnover) between 10 and 50 million €. In most states in the U.S. the category of SME companies are described as having a size of up to 500 employees.