Hi mala,
Basically your choise would depend on the duration of riding , there are 5 types of bikes available -
Road bikes: They are meant to cover long distances mainly on the roads. Their light weight and narrow tires help you to conserve energy during long rides.
Mountain bikes: As the name suggest these bikes are extremely strong, the tires have knobby treads and they are specifically designed for really rough terrain.
Hybrid bikes: They are a combination of mountain and road bikes.
Cruisers: Also called as touring bikes, they have wide tires, upright handlebars and most of the times are loaded with a gear box.
Utility bicycles: They are designed for commuting, shopping and running. They employ middle or heavy weight frames and tires and they often have internal hub gearing.
for more info you can also check this article
http://www.lifemojo.com/lifestyle/choosing-the-right-bicycle-615611