A kiosk is a small, separated Garden Pavilion that is usually open on all sides (although this is not always the case) and often dispenses some for of commercial item. Kiosks were common in Persia and India from as early as the 13th Century onwards.
Commercial Kiosks
Today there are many commercial kiosks over the world, although the original function has been modified to something that is more practical and affordable in this day and age. 
For example, the UK you would here of an Information Kiosk, which is not actually a kiosk in the form of a small portable polygonal structure but usually a building, or part of a town hall, that dispenses information verbally and through leaflets regarding the surrounding area.
These are specifically known as "Tourist Information" kiosks that were originally actual kiosks used by tourists to find out information about the surrounding area.
The most popular form of commercial kiosk found in the UK is that which sells newspapers, magazines, lighters and other inexpensive consumables and can be found in most towns and cities throughout the country.
Garden Kiosks
During the 18th century, Turkish influences in Europe established the garden kiosk (gazebo) as an important feature in European gardens.
The word, which is of Turkish origin, refers to an object that acts as a shadow or shade-maker. In fact, more detailed etymological studies reveal that the word "kosk" has the same ancient root as the Turkish word for shadow ("golge").
As a building type garden kiosks were first introduced by the Seljuks as a small building attached to a main mosque, which consisted of a domed hall with open arched sides. This architectural concept gradually evolved into a small yet grand residence used by Ottoman sultans.
Computer Kiosks
An electronic kiosk, also known as a computer kiosk, is a computer terminal that often employs custom kiosk software designed to function flawlessly while preventing user from accessing certain system functions.
Computer Kiosks may store information locally, or retrieve it from another computer network. Some computer kiosks can be found on streets and provide free, informational public services as well as the ability to send E-Mail.
There are also computer kiosks which provide a commercial service on the same level but not available to the public.