WIFI hotspot helps users share their Internet connection easily over WIFI. It is usually a default feature for some devices. If it is not already installed on your android device, you can get it separately from Google Play.
To start tethering , do as follows
1. go to Settings > Wireless and networks > Tethering and portable hotspot
2. activate Portable WIFI hotspot.
Now your device internet connection is shared.
You can also set a password for your connection under the Configure Portable WIFI Hotspot menu