There really isn’t any guidelines for when the term small business is used, however it is simply defined as a business which has a small number of employees. How few employees is debatable, and the definition of when a business changes from a small business to a larger corporation varies both by country and industry. This number is generally less then 100 employees.
As mentioned before small businesses due to their nature, are in most times sole proprietorships, partnerships, or privately owned. Common in may countries, small businesses, are most oftenly related to: accountants, restaurants, guest houses, photographers, small shops, hairdressers, tradesmen, solicitors, lawyers, small-scale manufacturing etc. Small businesses in often cases are located in private homes, for two main reasons. The first is because it is economical and in most cases convenient. The second reason is that there are several benifits with tax,etc for having your business in your home.
Running a small business is an exciting venture, and a great way to introduce yourself into the business world, and to gain business sense. If you are interested in starting your own small business, I would recommend having a talk with a local lawyer or accountant, who will be able to answer questions that are specific to your local area. Good luck with your new venture!