Business Visas are basically similar to tourist visas. It only differs to it in that they are issued to travelers visiting Turkey for temporary business purposes. Either you are coming to Turkey for meetings, conferences, lectures and so on, just like for tourist visas can normally being issued for up to 90 days and are valid for a single entry.
Note: Keep in mind that if you need a business visa, you will need proof of your business in Turkey. Thus, your employer must provide you with an appropriate letter or document.