A kiosk is a very small, very simple building out of which things are sold. You might find kiosks in the street, selling newspapers, cigarettes, soft drinks, lottery tickets, and suchlike. It's a couple of metres high by a couple of metres wide. There's usually just enough room inside a kiosk for a salesperson and his merchandise. Unlike a market stall - which is put up each day and taken down again - a kiosk is a relatively permanent structure, even though it's very basic. It's a Turkish word, originally from Persian, which has found its way into many other languages in the world. The meaning above is how 'kiosk' usually used in English. I hope that answers your question.

There is the same word, with the same pronuncation in Russian language. It's "Киоск". http://ugrainform.ru/upload/medialibrary/43c/43c2d08d723fcf5e373b3ef5036ea136.jpg

To me, it means a building like this: https://upload.wikimedia.org/wikipedia/commons/thumb/5/50/Kiosk_Greece.JPG/1024px-Kiosk_Greece.JPG

In addition to the kiosk SuKi describes, a kiosk is a freestanding unit with a computer built it. It is usually about waist-high, but can be head-high, depending on where the computer screen is built into it. It is used for a variety of purposes: for self-service transactions, like check-in at an airport, for interactive information displays at a museum, for selling tickets in a subway station. In some ways, it's a mix between a modern vending machine and a museum guide, depending on where it's used.