Giants are one of the vital pieces in the Clash of Clans Defense, they not only help to get rid of enemy defense towers, but also can be used for defending building of own army or troop. They are third in the row of unlocking different type of characters from barracks.
The main use of giants is to destroy enemy defense towers and building, and they selectively ignore all other type of building. They prioritize in destroying enemy defense buildings such a way that even if the armies are in war, they ignore all other troops or building types. Only when all enemy defense buildings are destroyed, they can be used as other troops with no preselected target in their mind.
The best strategy involving giants is to fill the army with giants and archers, so that giants can take down all major enemy defense towers and buildings while archers take down everything else. The high hit point and low damage ratio of giants make them especially capable for this task.
The main advantage of giants is their high health, so if a group of them are deployed, enemy troops have a hard time to neutralize them. Giants are thus very capable of any army, they can be created from level 1 and go to as high as level 7, with beards and rough cloths, who are best in the action to destroy enemy structures. The only weak point of giants is that they are slow and low attack damage so must be grouped together to get best results.