age,Bronze age,and Iron age.The Stone age is 

so long,so it is divided into 2 Stone age.The 2 Stone  ages are old stone age and new stone age.

The old stone age is that people break the  big rock and get sharp rock to use.

In new stone age,they grin with rock.They knew that if they grin with rock they can made weapons

more sharper and delicacy than breaking the rock. 

In bronze age,they made dagger with bronze. The  difference from Chinese dagger and Korean dagger is Korean is made in 2pieces,grip and blade,but Chinese dagger is made in only one piece.And they made tomb Dolmen,when leader of village dead.So we can see a lot of Dolmens when bronze age person lived.Also,they build houses and live together.

In historic age,there are three kingdoms: Silla,Beakje,and Goguryeo.Also there was Gaya to but it was too small to call kingdom and 6kings ruled 6seperated Gaya.

Last,difference of prehistoric age and historic age is prehistoric age don't use words,but historic age use word.