Android devices come mostly with little internal memory so you can’t install a lot of apps. It’s possible to move some (not all) applications to your SD card to make space for the internal memory.
– Go to settings => Applications and click ‘Manage Applications’
– Search for the desired app and select it
– Tick the button ‘Move to SD card’ to move the application (if the option isn’t available, the app needs to be installed on the internal memory)